21315020264 has 32 divisors (see below), whose sum is σ = 40096485000. Its totient is φ = 10622668800.

The previous prime is 21315020231. The next prime is 21315020297. The reversal of 21315020264 is 46202051312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21315020231) and next prime (21315020297).

It can be written as a sum of positive squares in 4 ways, for example, as 21272222500 + 42797764 = 145850^2 + 6542^2 .

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, 7752362 + ... + 7755110.

Almost surely, 2^21315020264 is an apocalyptic number.

It is an amenable number.

21315020264 is a deficient number, since it is larger than the sum of its proper divisors (18781464736).

21315020264 is a wasteful number, since it uses less digits than its factorization.

21315020264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21315020264 its reverse (46202051312), we get a palindrome (67517071576).

The spelling of 21315020264 in words is "twenty-one billion, three hundred fifteen million, twenty thousand, two hundred sixty-four".