21800752264 has 16 divisors (see below), whose sum is σ = 43280905500. Its totient is φ = 10259177472.

The previous prime is 21800752163. The next prime is 21800752289. The reversal of 21800752264 is 46225700812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21798160164 + 2592100 = 147642^2 + 1610^2 .

It is a super-2 number, since 2×21800752264² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80149689 + ... + 80149960.

Almost surely, 2^21800752264 is an apocalyptic number.

It is an amenable number.

21800752264 is a deficient number, since it is larger than the sum of its proper divisors (21480153236).

21800752264 is a wasteful number, since it uses less digits than its factorization.

21800752264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160299672 (or 160299668 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 21800752264 in words is "twenty-one billion, eight hundred million, seven hundred fifty-two thousand, two hundred sixty-four".