21501170960 has 80 divisors (see below), whose sum is σ = 53846553600. Its totient is φ = 7961141760.

The previous prime is 21501170921. The next prime is 21501170969. The reversal of 21501170960 is 6907110512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21501170960² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21501170969) 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, 131435 + ... + 245514.

It is an arithmetic number, because the mean of its divisors is an integer number (673081920).

Almost surely, 2^21501170960 is an apocalyptic number.

21501170960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21501170960 is an abundant number, since it is smaller than the sum of its proper divisors (32345382640).

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

21501170960 is a wasteful number, since it uses less digits than its factorization.

21501170960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377016 (or 377010 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 32.

The spelling of 21501170960 in words is "twenty-one billion, five hundred one million, one hundred seventy thousand, nine hundred sixty".