21611771150751 has 12 divisors (see below), whose sum is σ = 31253599505128. Its totient is φ = 14390956634544.

The previous prime is 21611771150701. The next prime is 21611771150797. The reversal of 21611771150751 is 15705117711612.

21611771150751 is a `hidden beast` number, since 2 + 1 + 6 + 11 + 77 + 11 + 507 + 51 = 666.

It is not a de Polignac number, because 21611771150751 - 2¹¹ = 21611771148703 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21611771150697 and 21611771150706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611771150701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1407558505 + ... + 1407573858.

Almost surely, 2^{21611771150751} is an apocalyptic number.

21611771150751 is a deficient number, since it is larger than the sum of its proper divisors (9641828354377).

21611771150751 is a wasteful number, since it uses less digits than its factorization.

21611771150751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815133222 (or 2815133219 counting only the distinct ones).

The product of its (nonzero) digits is 102900, while the sum is 45.

The spelling of 21611771150751 in words is "twenty-one trillion, six hundred eleven billion, seven hundred seventy-one million, one hundred fifty thousand, seven hundred fifty-one".