21892620625 has 10 divisors (see below), whose sum is σ = 27357019514. Its totient is φ = 17514096000.

The previous prime is 21892620601. The next prime is 21892620647. The reversal of 21892620625 is 52602629812.

It can be written as a sum of positive squares in 5 ways, for example, as 10038637249 + 11853983376 = 100193^2 + 108876^2 .

It is not a de Polignac number, because 21892620625 - 2⁵ = 21892620593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17513472 + ... + 17514721.

Almost surely, 2^21892620625 is an apocalyptic number.

21892620625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21892620625 is a deficient number, since it is larger than the sum of its proper divisors (5464398889).

21892620625 is an frugal number, since it uses more digits than its factorization.

21892620625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35028213 (or 35028198 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 21892620625 in words is "twenty-one billion, eight hundred ninety-two million, six hundred twenty thousand, six hundred twenty-five".