21155542625504 has 96 divisors (see below), whose sum is σ = 47657239035840. Its totient is φ = 9055756910592.

The previous prime is 21155542625453. The next prime is 21155542625513. The reversal of 21155542625504 is 40552624555112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1752296012 + ... + 1752308084.

It is an arithmetic number, because the mean of its divisors is an integer number (496429573290).

Almost surely, 2^{21155542625504} is an apocalyptic number.

It is an amenable number.

21155542625504 is an abundant number, since it is smaller than the sum of its proper divisors (26501696410336).

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

21155542625504 is a wasteful number, since it uses less digits than its factorization.

21155542625504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20852 (or 20844 counting only the distinct ones).

The product of its (nonzero) digits is 2400000, while the sum is 47.

The spelling of 21155542625504 in words is "twenty-one trillion, one hundred fifty-five billion, five hundred forty-two million, six hundred twenty-five thousand, five hundred four".