21123232004 has 24 divisors (see below), whose sum is σ = 42258171648. Its totient is φ = 9050304960.

The previous prime is 21123231953. The next prime is 21123232049. The reversal of 21123232004 is 40023232112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149 + ... + 205539.

It is an arithmetic number, because the mean of its divisors is an integer number (1760757152).

Almost surely, 2^21123232004 is an apocalyptic number.

It is an amenable number.

21123232004 is an abundant number, since it is smaller than the sum of its proper divisors (21134939644).

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

21123232004 is a wasteful number, since it uses less digits than its factorization.

21123232004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209075 (or 209073 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21123232004 its reverse (40023232112), we get a palindrome (61146464116).

The spelling of 21123232004 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, four".