21510401512 has 32 divisors (see below), whose sum is σ = 43219008000. Its totient is φ = 10000578304.

The previous prime is 21510401509. The next prime is 21510401533.

21510401512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21510401512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941512 + ... + 964087.

It is an arithmetic number, because the mean of its divisors is an integer number (1350594000).

Almost surely, 2^21510401512 is an apocalyptic number.

It is an amenable number.

21510401512 is an abundant number, since it is smaller than the sum of its proper divisors (21708606488).

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

21510401512 is a wasteful number, since it uses less digits than its factorization.

21510401512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905705 (or 1905701 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 21510401512 in words is "twenty-one billion, five hundred ten million, four hundred one thousand, five hundred twelve".