21501293160 has 64 divisors (see below), whose sum is σ = 64518094080. Its totient is φ = 5732414720.

The previous prime is 21501293153. The next prime is 21501293161. The reversal of 21501293160 is 6139210512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21501293161) 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, 610594 + ... + 644846.

It is an arithmetic number, because the mean of its divisors is an integer number (1008095220).

Almost surely, 2^21501293160 is an apocalyptic number.

21501293160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21501293160 is an abundant number, since it is smaller than the sum of its proper divisors (43016800920).

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

21501293160 is a wasteful number, since it uses less digits than its factorization.

21501293160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39498 (or 39494 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 21501293160 in words is "twenty-one billion, five hundred one million, two hundred ninety-three thousand, one hundred sixty".