21504053210552 has 16 divisors (see below), whose sum is σ = 43985563385400. Its totient is φ = 9774569641120.

The previous prime is 21504053210527. The next prime is 21504053210567. The reversal of 21504053210552 is 25501235040512.

It is a happy number.

It is a congruent number.

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, 122182120427 + ... + 122182120602.

Almost surely, 2^{21504053210552} is an apocalyptic number.

21504053210552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21504053210552 is an abundant number, since it is smaller than the sum of its proper divisors (22481510174848).

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

21504053210552 is a wasteful number, since it uses less digits than its factorization.

21504053210552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244364241046 (or 244364241042 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 21504053210552 in words is "twenty-one trillion, five hundred four billion, fifty-three million, two hundred ten thousand, five hundred fifty-two".