21546342127325 has 12 divisors (see below), whose sum is σ = 26719548518388. Its totient is φ = 17235729004800.

The previous prime is 21546342127253. The next prime is 21546342127327. The reversal of 21546342127325 is 52372124364512.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7662587987044 + 13883754140281 = 2768138^2 + 3726091^2 .

It is not a de Polignac number, because 21546342127325 - 2⁸ = 21546342127069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21546342127325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21546342127327) 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, 33290492 + ... + 33931541.

It is an arithmetic number, because the mean of its divisors is an integer number (2226629043199).

Almost surely, 2^{21546342127325} is an apocalyptic number.

21546342127325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21546342127325 is a deficient number, since it is larger than the sum of its proper divisors (5173206391063).

21546342127325 is a wasteful number, since it uses less digits than its factorization.

21546342127325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67234864 (or 67234859 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 47.

The spelling of 21546342127325 in words is "twenty-one trillion, five hundred forty-six billion, three hundred forty-two million, one hundred twenty-seven thousand, three hundred twenty-five".