21252705725255 has 16 divisors (see below), whose sum is σ = 25810982031744. Its totient is φ = 16797015221280.

The previous prime is 21252705725243. The next prime is 21252705725257. The reversal of 21252705725255 is 55252750725212.

It is not a de Polignac number, because 21252705725255 - 2⁶ = 21252705725191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252705725257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24055652 + ... + 24923478.

It is an arithmetic number, because the mean of its divisors is an integer number (1613186376984).

Almost surely, 2^{21252705725255} is an apocalyptic number.

21252705725255 is a deficient number, since it is larger than the sum of its proper divisors (4558276306489).

21252705725255 is an equidigital number, since it uses as much as digits as its factorization.

21252705725255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926926.

The product of its (nonzero) digits is 4900000, while the sum is 50.

The spelling of 21252705725255 in words is "twenty-one trillion, two hundred fifty-two billion, seven hundred five million, seven hundred twenty-five thousand, two hundred fifty-five".