21520546265144 has 16 divisors (see below), whose sum is σ = 40442110087320. Its totient is φ = 10735983575200.

The previous prime is 21520546265129. The next prime is 21520546265147. The reversal of 21520546265144 is 44156264502512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520546265147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3036190907 + ... + 3036197994.

Almost surely, 2^{21520546265144} is an apocalyptic number.

It is an amenable number.

21520546265144 is a deficient number, since it is larger than the sum of its proper divisors (18921563822176).

21520546265144 is a wasteful number, since it uses less digits than its factorization.

21520546265144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072389350 (or 6072389346 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 47.

The spelling of 21520546265144 in words is "twenty-one trillion, five hundred twenty billion, five hundred forty-six million, two hundred sixty-five thousand, one hundred forty-four".