21123504520124 has 12 divisors (see below), whose sum is σ = 38911718853000. Its totient is φ = 10005870562128.

The previous prime is 21123504520121. The next prime is 21123504520163. The reversal of 21123504520124 is 42102540532112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123504520121) 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, 138970424399 + ... + 138970424550.

It is an arithmetic number, because the mean of its divisors is an integer number (3242643237750).

Almost surely, 2^{21123504520124} is an apocalyptic number.

It is an amenable number.

21123504520124 is a deficient number, since it is larger than the sum of its proper divisors (17788214332876).

21123504520124 is a wasteful number, since it uses less digits than its factorization.

21123504520124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277940848972 (or 277940848970 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 21123504520124 in words is "twenty-one trillion, one hundred twenty-three billion, five hundred four million, five hundred twenty thousand, one hundred twenty-four".