21232511204 has 12 divisors (see below), whose sum is σ = 37604568624. Its totient is φ = 10488348744.

The previous prime is 21232511173. The next prime is 21232511219. The reversal of 21232511204 is 40211523212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232511204.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31976342 + ... + 31977005.

It is an arithmetic number, because the mean of its divisors is an integer number (3133714052).

Almost surely, 2^21232511204 is an apocalyptic number.

It is an amenable number.

21232511204 is a deficient number, since it is larger than the sum of its proper divisors (16372057420).

21232511204 is a wasteful number, since it uses less digits than its factorization.

21232511204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63953434 (or 63953432 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 21232511204 in words is "twenty-one billion, two hundred thirty-two million, five hundred eleven thousand, two hundred four".