21052559025 has 81 divisors (see below), whose sum is σ = 40126555651. Its totient is φ = 10548986880.

The previous prime is 21052558993. The next prime is 21052559029. The reversal of 21052559025 is 52095525012.

The square root of 21052559025 is 145095.

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

21052559025 is a `hidden beast` number, since 2 + 10 + 52 + 5 + 590 + 2 + 5 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 14891564961 + 6160994064 = 122031^2 + 78492^2 .

It is not a de Polignac number, because 21052559025 - 2⁵ = 21052558993 is a prime.

It is a super-2 number, since 2×21052559025² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052559029) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 36998941 + ... + 36999509.

Almost surely, 2^21052559025 is an apocalyptic number.

21052559025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21052559025 is the 145095-th square number.

21052559025 is the 72548-th centered octagonal number.

It is an amenable number.

21052559025 is a deficient number, since it is larger than the sum of its proper divisors (19073996626).

21052559025 is an equidigital number, since it uses as much as digits as its factorization.

21052559025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

Multiplying 21052559025 by its sum of digits (36), we get a square (757892124900 = 870570²).

The spelling of 21052559025 in words is "twenty-one billion, fifty-two million, five hundred fifty-nine thousand, twenty-five".