21354363125 has 40 divisors (see below), whose sum is σ = 27498966264. Its totient is φ = 16567040000.

The previous prime is 21354363103. The next prime is 21354363127. The reversal of 21354363125 is 52136345312.

It is a happy number.

It can be written as a sum of positive squares in 20 ways, for example, as 20726209156 + 628153969 = 143966^2 + 25063^2 .

It is not a de Polignac number, because 21354363125 - 2⁶ = 21354363061 is a prime.

It is a super-3 number, since 3×21354363125³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354363127) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4430717 + ... + 4435533.

Almost surely, 2^21354363125 is an apocalyptic number.

21354363125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21354363125 is a deficient number, since it is larger than the sum of its proper divisors (6144603139).

21354363125 is an equidigital number, since it uses as much as digits as its factorization.

21354363125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051 (or 5036 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The spelling of 21354363125 in words is "twenty-one billion, three hundred fifty-four million, three hundred sixty-three thousand, one hundred twenty-five".