21059425793025 has 117 divisors (see below), whose sum is σ = 39201644514931. Its totient is φ = 11222772633360.

The previous prime is 21059425793023. The next prime is 21059425793051. The reversal of 21059425793025 is 52039752495012.

The square root of 21059425793025 is 4589055.

It is a perfect power (a square), and thus also a powerful number.

21059425793025 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 9 + 42 + 579 + 3 + 0 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7581393285489 + 13478032507536 = 2753433^2 + 3671244^2 .

It is not a de Polignac number, because 21059425793025 - 2¹ = 21059425793023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21059425793023) by changing a digit.

It is a polite number, since it can be written in 116 ways as a sum of consecutive naturals, for example, 16727104846 + ... + 16727106104.

Almost surely, 2^{21059425793025} is an apocalyptic number.

21059425793025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21059425793025 is the 4589055-th square number.

21059425793025 is the 2294528-th centered octagonal number.

It is an amenable number.

21059425793025 is a deficient number, since it is larger than the sum of its proper divisors (18142218721906).

21059425793025 is an frugal number, since it uses more digits than its factorization.

21059425793025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564 (or 1267 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 54.

The spelling of 21059425793025 in words is "twenty-one trillion, fifty-nine billion, four hundred twenty-five million, seven hundred ninety-three thousand, twenty-five".