21252885708 has 48 divisors (see below), whose sum is σ = 53414049920. Its totient is φ = 6555354624.

The previous prime is 21252885691. The next prime is 21252885721. The reversal of 21252885708 is 80758825212.

It is a super-2 number, since 2×21252885708² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1074085 + ... + 1093692.

Almost surely, 2^21252885708 is an apocalyptic number.

It is an amenable number.

21252885708 is an abundant number, since it is smaller than the sum of its proper divisors (32161164212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21252885708 is a wasteful number, since it uses less digits than its factorization.

21252885708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167846 (or 2167844 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 48.

The spelling of 21252885708 in words is "twenty-one billion, two hundred fifty-two million, eight hundred eighty-five thousand, seven hundred eight".