21403303044 has 24 divisors (see below), whose sum is σ = 49971932640. Its totient is φ = 7130021184.

The previous prime is 21403303037. The next prime is 21403303063. The reversal of 21403303044 is 44030330412.

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, 531409 + ... + 570264.

It is an arithmetic number, because the mean of its divisors is an integer number (2082163860).

Almost surely, 2^21403303044 is an apocalyptic number.

It is an amenable number.

21403303044 is an abundant number, since it is smaller than the sum of its proper divisors (28568629596).

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

21403303044 is a wasteful number, since it uses less digits than its factorization.

21403303044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103299 (or 1103297 counting only the distinct ones).

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

Adding to 21403303044 its reverse (44030330412), we get a palindrome (65433633456).

The spelling of 21403303044 in words is "twenty-one billion, four hundred three million, three hundred three thousand, forty-four".