21515522502412 has 12 divisors (see below), whose sum is σ = 37652417637520. Its totient is φ = 10757688891696.

The previous prime is 21515522502403. The next prime is 21515522502451. The reversal of 21515522502412 is 21420522551512.

It is a happy number.

It is a super-3 number, since 3×21515522502412³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17418087 + ... + 18612382.

Almost surely, 2^{21515522502412} is an apocalyptic number.

It is an amenable number.

21515522502412 is a deficient number, since it is larger than the sum of its proper divisors (16136895135108).

21515522502412 is a wasteful number, since it uses less digits than its factorization.

21515522502412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36179760 (or 36179758 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 37.

The spelling of 21515522502412 in words is "twenty-one trillion, five hundred fifteen billion, five hundred twenty-two million, five hundred two thousand, four hundred twelve".