21203332044 has 36 divisors (see below), whose sum is σ = 49990011624. Its totient is φ = 6994876416.

The previous prime is 21203332013. The next prime is 21203332063. The reversal of 21203332044 is 44023330212.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19012 + ... + 206804.

It is an arithmetic number, because the mean of its divisors is an integer number (1388611434).

Almost surely, 2^21203332044 is an apocalyptic number.

It is an amenable number.

21203332044 is an abundant number, since it is smaller than the sum of its proper divisors (28786679580).

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

21203332044 is a wasteful number, since it uses less digits than its factorization.

21203332044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187994 (or 187895 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21203332044 its reverse (44023330212), we get a palindrome (65226662256).

The spelling of 21203332044 in words is "twenty-one billion, two hundred three million, three hundred thirty-two thousand, forty-four".