21592394145125 has 36 divisors (see below), whose sum is σ = 27297919575108. Its totient is φ = 17052016332000.

The previous prime is 21592394145089. The next prime is 21592394145163. The reversal of 21592394145125 is 52154149329512.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 2542041206884 + 19050352938241 = 1594378^2 + 4364671^2 .

It is not a de Polignac number, because 21592394145125 - 2¹⁶ = 21592394079589 is a prime.

It is a super-2 number, since 2×21592394145125² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4104234995 + ... + 4104240255.

It is an arithmetic number, because the mean of its divisors is an integer number (758275543753).

Almost surely, 2^{21592394145125} is an apocalyptic number.

21592394145125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21592394145125 is a deficient number, since it is larger than the sum of its proper divisors (5705525429983).

21592394145125 is an frugal number, since it uses more digits than its factorization.

21592394145125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10695 (or 5345 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 53.

The spelling of 21592394145125 in words is "twenty-one trillion, five hundred ninety-two billion, three hundred ninety-four million, one hundred forty-five thousand, one hundred twenty-five".