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212211221 = 1712483013
BaseRepresentation
bin11001010011000…
…01011000010101
3112210022110001212
430221201120111
5413311224341
633020231205
75154523415
oct1451413025
9483273055
10212211221
11a9873482
125b09b505
1334c71491
1420280645
151396c5eb
hexca61615

212211221 has 4 divisors (see below), whose sum is σ = 224694252. Its totient is φ = 199728192.

The previous prime is 212211193. The next prime is 212211269. The reversal of 212211221 is 122112212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182115025 + 30096196 = 13495^2 + 5486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-212211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212211196 and 212211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6241490 + ... + 6241523.

It is an arithmetic number, because the mean of its divisors is an integer number (56173563).

Almost surely, 2212211221 is an apocalyptic number.

It is an amenable number.

212211221 is a deficient number, since it is larger than the sum of its proper divisors (12483031).

212211221 is a wasteful number, since it uses less digits than its factorization.

212211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12483030.

The product of its digits is 32, while the sum is 14.

The square root of 212211221 is about 14567.4713317034. The cubic root of 212211221 is about 596.4711574352.

Adding to 212211221 its reverse (122112212), we get a palindrome (334323433).

Subtracting from 212211221 its reverse (122112212), we obtain a palindrome (90099009).

It can be divided in two parts, 2 and 12211221, that multiplied together give a palindrome (24422442).

The spelling of 212211221 in words is "two hundred twelve million, two hundred eleven thousand, two hundred twenty-one".

Divisors: 1 17 12483013 212211221