21628750375 has 16 divisors (see below), whose sum is σ = 27863417088. Its totient is φ = 16744836000.

The previous prime is 21628750321. The next prime is 21628750393. The reversal of 21628750375 is 57305782612.

It is not a de Polignac number, because 21628750375 - 2¹³ = 21628742183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2786932 + ... + 2794681.

It is an arithmetic number, because the mean of its divisors is an integer number (1741463568).

Almost surely, 2^21628750375 is an apocalyptic number.

21628750375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21628750375 is a deficient number, since it is larger than the sum of its proper divisors (6234666713).

21628750375 is an equidigital number, since it uses as much as digits as its factorization.

21628750375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581659 (or 5581649 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 46.

It can be divided in two parts, 216287 and 50375, that added together give a palindrome (266662).

The spelling of 21628750375 in words is "twenty-one billion, six hundred twenty-eight million, seven hundred fifty thousand, three hundred seventy-five".