21520450151524 has 24 divisors (see below), whose sum is σ = 38882648930048. Its totient is φ = 10411246833120.

The previous prime is 21520450151503. The next prime is 21520450151587. The reversal of 21520450151524 is 42515105402512.

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, 14926554 + ... + 16304689.

Almost surely, 2^{21520450151524} is an apocalyptic number.

It is an amenable number.

21520450151524 is a deficient number, since it is larger than the sum of its proper divisors (17362198778524).

21520450151524 is a wasteful number, since it uses less digits than its factorization.

21520450151524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31236835 (or 31236833 counting only the distinct ones).

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

The spelling of 21520450151524 in words is "twenty-one trillion, five hundred twenty billion, four hundred fifty million, one hundred fifty-one thousand, five hundred twenty-four".