212413221 has 12 divisors (see below), whose sum is σ = 306966348. Its totient is φ = 141540864.

The previous prime is 212413213. The next prime is 212413237. The reversal of 212413221 is 122314212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 141348321 + 71064900 = 11889^2 + 8430^2 .

It is not a de Polignac number, because 212413221 - 2³ = 212413213 is a prime.

It is a super-3 number, since 3×212413221³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212413194 and 212413203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212413321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20491 + ... + 29063.

It is an arithmetic number, because the mean of its divisors is an integer number (25580529).

Almost surely, 2^212413221 is an apocalyptic number.

It is an amenable number.

212413221 is a deficient number, since it is larger than the sum of its proper divisors (94553127).

212413221 is a wasteful number, since it uses less digits than its factorization.

212413221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11332 (or 11329 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 212413221 is about 14574.4029380280. The cubic root of 212413221 is about 596.6603540975.

Adding to 212413221 its reverse (122314212), we get a palindrome (334727433).

Subtracting from 212413221 its reverse (122314212), we obtain a palindrome (90099009).

The spelling of 212413221 in words is "two hundred twelve million, four hundred thirteen thousand, two hundred twenty-one".