21124265604 has 24 divisors (see below), whose sum is σ = 53081488320. Its totient is φ = 6499773984.

The previous prime is 21124265599. The next prime is 21124265609. The reversal of 21124265604 is 40656242112.

It is an interprime number because it is at equal distance from previous prime (21124265599) and next prime (21124265609).

It is not an unprimeable number, because it can be changed into a prime (21124265609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67705824 + ... + 67706135.

It is an arithmetic number, because the mean of its divisors is an integer number (2211728680).

Almost surely, 2^21124265604 is an apocalyptic number.

It is an amenable number.

21124265604 is an abundant number, since it is smaller than the sum of its proper divisors (31957222716).

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

21124265604 is a wasteful number, since it uses less digits than its factorization.

21124265604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135411979 (or 135411977 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21124265604 in words is "twenty-one billion, one hundred twenty-four million, two hundred sixty-five thousand, six hundred four".