21125665240552 has 16 divisors (see below), whose sum is σ = 39615624417600. Its totient is φ = 10561498729200.

The previous prime is 21125665240549. The next prime is 21125665240553. The reversal of 21125665240552 is 25504256652112.

It is not an unprimeable number, because it can be changed into a prime (21125665240553) 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, 166669074 + ... + 166795777.

It is an arithmetic number, because the mean of its divisors is an integer number (2475976526100).

Almost surely, 2^{21125665240552} is an apocalyptic number.

It is an amenable number.

21125665240552 is a deficient number, since it is larger than the sum of its proper divisors (18489959177048).

21125665240552 is a wasteful number, since it uses less digits than its factorization.

21125665240552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333472776 (or 333472772 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 46.

The spelling of 21125665240552 in words is "twenty-one trillion, one hundred twenty-five billion, six hundred sixty-five million, two hundred forty thousand, five hundred fifty-two".