21365041704125 has 32 divisors (see below), whose sum is σ = 30858383662080. Its totient is φ = 14464867248000.

The previous prime is 21365041704121. The next prime is 21365041704131. The reversal of 21365041704125 is 52140714056312.

It is not a de Polignac number, because 21365041704125 - 2² = 21365041704121 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365041704121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154470056 + ... + 154608305.

It is an arithmetic number, because the mean of its divisors is an integer number (964324489440).

Almost surely, 2^{21365041704125} is an apocalyptic number.

21365041704125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21365041704125 is a deficient number, since it is larger than the sum of its proper divisors (9493341957955).

21365041704125 is an equidigital number, since it uses as much as digits as its factorization.

21365041704125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309078462 (or 309078452 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 21365041704125 in words is "twenty-one trillion, three hundred sixty-five billion, forty-one million, seven hundred four thousand, one hundred twenty-five".