21651767411706 has 12 divisors (see below), whose sum is σ = 46912162725402. Its totient is φ = 7217255803896.

The previous prime is 21651767411683. The next prime is 21651767411749. The reversal of 21651767411706 is 60711476715612.

21651767411706 is a `hidden beast` number, since 2 + 1 + 6 + 517 + 6 + 7 + 4 + 117 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20086038245025 + 1565729166681 = 4481745^2 + 1251291^2 .

It is a super-2 number, since 2×21651767411706² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 601437983641 + ... + 601437983676.

Almost surely, 2^{21651767411706} is an apocalyptic number.

21651767411706 is an abundant number, since it is smaller than the sum of its proper divisors (25260395313696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21651767411706 is a wasteful number, since it uses less digits than its factorization.

21651767411706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202875967325 (or 1202875967322 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 21651767411706 in words is "twenty-one trillion, six hundred fifty-one billion, seven hundred sixty-seven million, four hundred eleven thousand, seven hundred six".