21155531520324 has 24 divisors (see below), whose sum is σ = 49363008772000. Its totient is φ = 7051829284224.

The previous prime is 21155531520317. The next prime is 21155531520359. The reversal of 21155531520324 is 42302513555112.

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, 5373927 + ... + 8437425.

Almost surely, 2^{21155531520324} is an apocalyptic number.

It is an amenable number.

21155531520324 is an abundant number, since it is smaller than the sum of its proper divisors (28207477251676).

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

21155531520324 is a wasteful number, since it uses less digits than its factorization.

21155531520324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638979 (or 3638977 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 21155531520324 in words is "twenty-one trillion, one hundred fifty-five billion, five hundred thirty-one million, five hundred twenty thousand, three hundred twenty-four".