21204232044 has 24 divisors (see below), whose sum is σ = 49626026688. Its totient is φ = 7046722320.

The previous prime is 21204232043. The next prime is 21204232099. The reversal of 21204232044 is 44023240212.

It is not an unprimeable number, because it can be changed into a prime (21204232043) 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, 2665242 + ... + 2673185.

It is an arithmetic number, because the mean of its divisors is an integer number (2067751112).

Almost surely, 2^21204232044 is an apocalyptic number.

It is an amenable number.

21204232044 is an abundant number, since it is smaller than the sum of its proper divisors (28421794644).

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

21204232044 is a wasteful number, since it uses less digits than its factorization.

21204232044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338765 (or 5338763 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21204232044 its reverse (44023240212), we get a palindrome (65227472256).

The spelling of 21204232044 in words is "twenty-one billion, two hundred four million, two hundred thirty-two thousand, forty-four".