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211621001421 = 370540333807
BaseRepresentation
bin1100010100010110011…
…0000011100011001101
3202020020020020201112110
43011011212003203031
511431344434021141
6241114540254233
721201110555424
oct3050546034315
9666206221473
10211621001421
11818255a1605
123501b541379
1316c56ab658b
14a3576442bb
1557887cde16
hex31459838cd

211621001421 has 4 divisors (see below), whose sum is σ = 282161335232. Its totient is φ = 141080667612.

The previous prime is 211621001407. The next prime is 211621001441. The reversal of 211621001421 is 124100126112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211621001421 - 225 = 211587446989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211621001401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35270166901 + ... + 35270166906.

It is an arithmetic number, because the mean of its divisors is an integer number (70540333808).

Almost surely, 2211621001421 is an apocalyptic number.

It is an amenable number.

211621001421 is a deficient number, since it is larger than the sum of its proper divisors (70540333811).

211621001421 is an equidigital number, since it uses as much as digits as its factorization.

211621001421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70540333810.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 211621001421 its reverse (124100126112), we get a palindrome (335721127533).

The spelling of 211621001421 in words is "two hundred eleven billion, six hundred twenty-one million, one thousand, four hundred twenty-one".

Divisors: 1 3 70540333807 211621001421