21311053304 has 8 divisors (see below), whose sum is σ = 39958224960. Its totient is φ = 10655526648.

The previous prime is 21311053297. The next prime is 21311053327. The reversal of 21311053304 is 40335011312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21311053304.

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, 1331940824 + ... + 1331940839.

It is an arithmetic number, because the mean of its divisors is an integer number (4994778120).

Almost surely, 2^21311053304 is an apocalyptic number.

It is an amenable number.

21311053304 is a deficient number, since it is larger than the sum of its proper divisors (18647171656).

21311053304 is a wasteful number, since it uses less digits than its factorization.

21311053304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663881669 (or 2663881665 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21311053304 its reverse (40335011312), we get a palindrome (61646064616).

The spelling of 21311053304 in words is "twenty-one billion, three hundred eleven million, fifty-three thousand, three hundred four".