21706117165170 has 96 divisors (see below), whose sum is σ = 57638959941888. Its totient is φ = 5664917416704.

The previous prime is 21706117165169. The next prime is 21706117165189. The reversal of 21706117165170 is 7156171160712.

21706117165170 is a `hidden beast` number, since 2 + 1 + 7 + 0 + 6 + 117 + 16 + 517 + 0 = 666.

It is a super-2 number, since 2×21706117165170² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124219702 + ... + 124394318.

It is an arithmetic number, because the mean of its divisors is an integer number (600405832728).

Almost surely, 2^{21706117165170} is an apocalyptic number.

21706117165170 is an abundant number, since it is smaller than the sum of its proper divisors (35932842776718).

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

21706117165170 is a wasteful number, since it uses less digits than its factorization.

21706117165170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204064 (or 204061 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 45.

The spelling of 21706117165170 in words is "twenty-one trillion, seven hundred six billion, one hundred seventeen million, one hundred sixty-five thousand, one hundred seventy".