21356212304157 has 12 divisors (see below), whose sum is σ = 30052509282720. Its totient is φ = 13488134086152.

The previous prime is 21356212304123. The next prime is 21356212304179. The reversal of 21356212304157 is 75140321265312.

It is not a de Polignac number, because 21356212304157 - 2¹² = 21356212300061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356212304197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9859746057 + ... + 9859748222.

It is an arithmetic number, because the mean of its divisors is an integer number (2504375773560).

Almost surely, 2^{21356212304157} is an apocalyptic number.

It is an amenable number.

21356212304157 is a deficient number, since it is larger than the sum of its proper divisors (8696296978563).

21356212304157 is a wasteful number, since it uses less digits than its factorization.

21356212304157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19719494320 (or 19719494301 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

Adding to 21356212304157 its reverse (75140321265312), we get a palindrome (96496533569469).

The spelling of 21356212304157 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred twelve million, three hundred four thousand, one hundred fifty-seven".