21023001044 has 24 divisors (see below), whose sum is σ = 38266964736. Its totient is φ = 10094760000.

The previous prime is 21023001017. The next prime is 21023001047. The reversal of 21023001044 is 44010032012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023001047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630857 + ... + 663344.

It is an arithmetic number, because the mean of its divisors is an integer number (1594456864).

Almost surely, 2^21023001044 is an apocalyptic number.

It is an amenable number.

21023001044 is a deficient number, since it is larger than the sum of its proper divisors (17243963692).

21023001044 is a wasteful number, since it uses less digits than its factorization.

21023001044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294367 (or 1294365 counting only the distinct ones).

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

Adding to 21023001044 its reverse (44010032012), we get a palindrome (65033033056).

The spelling of 21023001044 in words is "twenty-one billion, twenty-three million, one thousand, forty-four".