21602170660 has 48 divisors (see below), whose sum is σ = 51856406784. Its totient is φ = 7404859008.

The previous prime is 21602170643. The next prime is 21602170661. The reversal of 21602170660 is 6607120612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21602170661) 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, 764097 + ... + 791863.

It is an arithmetic number, because the mean of its divisors is an integer number (1080341808).

Almost surely, 2^21602170660 is an apocalyptic number.

21602170660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21602170660 is an abundant number, since it is smaller than the sum of its proper divisors (30254236124).

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

21602170660 is a wasteful number, since it uses less digits than its factorization.

21602170660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33340 (or 33338 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 21602170660 in words is "twenty-one billion, six hundred two million, one hundred seventy thousand, six hundred sixty".