21248751512 has 64 divisors (see below), whose sum is σ = 41989933440. Its totient is φ = 10069657600.

The previous prime is 21248751499. The next prime is 21248751521. The reversal of 21248751512 is 21515784212.

21248751512 is an astonishing number since 21248751512 = 51512 + ... + 212487.

It is a super-2 number, since 2×21248751512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 2106962 + ... + 2117022.

It is an arithmetic number, because the mean of its divisors is an integer number (656092710).

Almost surely, 2^21248751512 is an apocalyptic number.

It is an amenable number.

21248751512 is a deficient number, since it is larger than the sum of its proper divisors (20741181928).

21248751512 is a wasteful number, since it uses less digits than its factorization.

21248751512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10292 (or 10288 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The spelling of 21248751512 in words is "twenty-one billion, two hundred forty-eight million, seven hundred fifty-one thousand, five hundred twelve".