21356253775161 has 16 divisors (see below), whose sum is σ = 32235854757120. Its totient is φ = 13968870392880.

The previous prime is 21356253775141. The next prime is 21356253775183. The reversal of 21356253775161 is 16157735265312.

21356253775161 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 6 + 2 + 53 + 77 + 516 + 1 = 666.

It is not a de Polignac number, because 21356253775161 - 2⁹ = 21356253774649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21356253775098 and 21356253775107.

It is not an unprimeable number, because it can be changed into a prime (21356253775141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7462001985 + ... + 7462004846.

It is an arithmetic number, because the mean of its divisors is an integer number (2014740922320).

Almost surely, 2^{21356253775161} is an apocalyptic number.

It is an amenable number.

21356253775161 is a deficient number, since it is larger than the sum of its proper divisors (10879600981959).

21356253775161 is a wasteful number, since it uses less digits than its factorization.

21356253775161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14924006893 (or 14924006887 counting only the distinct ones).

The product of its digits is 7938000, while the sum is 54.

The spelling of 21356253775161 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred fifty-three million, seven hundred seventy-five thousand, one hundred sixty-one".