21311013104 has 10 divisors (see below), whose sum is σ = 41290087920. Its totient is φ = 10655506544.

The previous prime is 21311013083. The next prime is 21311013133. The reversal of 21311013104 is 40131011312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665969144 + ... + 665969175.

It is an arithmetic number, because the mean of its divisors is an integer number (4129008792).

Almost surely, 2^21311013104 is an apocalyptic number.

It is an amenable number.

21311013104 is a deficient number, since it is larger than the sum of its proper divisors (19979074816).

21311013104 is a wasteful number, since it uses less digits than its factorization.

21311013104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331938327 (or 1331938321 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21311013104 its reverse (40131011312), we get a palindrome (61442024416).

The spelling of 21311013104 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, one hundred four".