21431321104 has 40 divisors (see below), whose sum is σ = 42237296640. Its totient is φ = 10532688768.

The previous prime is 21431321089. The next prime is 21431321123. The reversal of 21431321104 is 40112313412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220657 + ... + 302575.

It is an arithmetic number, because the mean of its divisors is an integer number (1055932416).

Almost surely, 2^21431321104 is an apocalyptic number.

It is an amenable number.

21431321104 is a deficient number, since it is larger than the sum of its proper divisors (20805975536).

21431321104 is a wasteful number, since it uses less digits than its factorization.

21431321104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82207 (or 82201 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21431321104 its reverse (40112313412), we get a palindrome (61543634516).

The spelling of 21431321104 in words is "twenty-one billion, four hundred thirty-one million, three hundred twenty-one thousand, one hundred four".