21617653170 has 48 divisors (see below), whose sum is σ = 52401882240. Its totient is φ = 5707550400.

The previous prime is 21617653139. The next prime is 21617653217. The reversal of 21617653170 is 7135671612.

It is a super-2 number, since 2×21617653170² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270711 + ... + 341349.

It is an arithmetic number, because the mean of its divisors is an integer number (1091705880).

Almost surely, 2^21617653170 is an apocalyptic number.

21617653170 is an abundant number, since it is smaller than the sum of its proper divisors (30784229070).

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

21617653170 is a wasteful number, since it uses less digits than its factorization.

21617653170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70851 (or 70750 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 21617653170 in words is "twenty-one billion, six hundred seventeen million, six hundred fifty-three thousand, one hundred seventy".