21012223004 has 24 divisors (see below), whose sum is σ = 37675989456. Its totient is φ = 10247760000.

The previous prime is 21012222991. The next prime is 21012223021. The reversal of 21012223004 is 40032221012.

It is a congruent number.

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, 1048034 + ... + 1067894.

It is an arithmetic number, because the mean of its divisors is an integer number (1569832894).

Almost surely, 2^21012223004 is an apocalyptic number.

It is an amenable number.

21012223004 is a deficient number, since it is larger than the sum of its proper divisors (16663766452).

21012223004 is a wasteful number, since it uses less digits than its factorization.

21012223004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26357 (or 26355 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21012223004 its reverse (40032221012), we get a palindrome (61044444016).

The spelling of 21012223004 in words is "twenty-one billion, twelve million, two hundred twenty-three thousand, four".