21502146008 has 32 divisors (see below), whose sum is σ = 46369524000. Its totient is φ = 9156506112.

The previous prime is 21502146007. The next prime is 21502146037. The reversal of 21502146008 is 80064120512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21502146007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1214033 + ... + 1231616.

It is an arithmetic number, because the mean of its divisors is an integer number (1449047625).

Almost surely, 2^21502146008 is an apocalyptic number.

21502146008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21502146008 is an abundant number, since it is smaller than the sum of its proper divisors (24867377992).

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

21502146008 is a wasteful number, since it uses less digits than its factorization.

21502146008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445819 (or 2445815 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 21502146008 in words is "twenty-one billion, five hundred two million, one hundred forty-six thousand, eight".