21939456951325 has 12 divisors (see below), whose sum is σ = 27209740974048. Its totient is φ = 17548459526000.

The previous prime is 21939456951323. The next prime is 21939456951383. The reversal of 21939456951325 is 52315965493912.

It is not a de Polignac number, because 21939456951325 - 2¹ = 21939456951323 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 (21939456951323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77506777 + ... + 77789326.

It is an arithmetic number, because the mean of its divisors is an integer number (2267478414504).

Almost surely, 2^{21939456951325} is an apocalyptic number.

21939456951325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21939456951325 is a deficient number, since it is larger than the sum of its proper divisors (5270284022723).

21939456951325 is a wasteful number, since it uses less digits than its factorization.

21939456951325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155301764 (or 155301759 counting only the distinct ones).

The product of its digits is 78732000, while the sum is 64.

The spelling of 21939456951325 in words is "twenty-one trillion, nine hundred thirty-nine billion, four hundred fifty-six million, nine hundred fifty-one thousand, three hundred twenty-five".