21042315304 has 8 divisors (see below), whose sum is σ = 39454341210. Its totient is φ = 10521157648.

The previous prime is 21042315299. The next prime is 21042315313. The reversal of 21042315304 is 40351324012.

It can be written as a sum of positive squares in only one way, i.e., 13850936100 + 7191379204 = 117690^2 + 84802^2 .

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

It is a super-2 number, since 2×21042315304² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315144699 + ... + 1315144714.

Almost surely, 2^21042315304 is an apocalyptic number.

It is an amenable number.

21042315304 is a deficient number, since it is larger than the sum of its proper divisors (18412025906).

21042315304 is a wasteful number, since it uses less digits than its factorization.

21042315304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630289419 (or 2630289415 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21042315304 its reverse (40351324012), we get a palindrome (61393639316).

The spelling of 21042315304 in words is "twenty-one billion, forty-two million, three hundred fifteen thousand, three hundred four".