21200521124 has 12 divisors (see below), whose sum is σ = 38713995264. Its totient is φ = 10139379624.

The previous prime is 21200521117. The next prime is 21200521127. The reversal of 21200521124 is 42112500212.

It is a junction number, because it is equal to n+sod(n) for n = 21200521096 and 21200521105.

It is not an unprimeable number, because it can be changed into a prime (21200521127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115220132 + ... + 115220315.

It is an arithmetic number, because the mean of its divisors is an integer number (3226166272).

Almost surely, 2^21200521124 is an apocalyptic number.

It is an amenable number.

21200521124 is a deficient number, since it is larger than the sum of its proper divisors (17513474140).

21200521124 is a wasteful number, since it uses less digits than its factorization.

21200521124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230440474 (or 230440472 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The spelling of 21200521124 in words is "twenty-one billion, two hundred million, five hundred twenty-one thousand, one hundred twenty-four".