21365025136127 has 16 divisors (see below), whose sum is σ = 22040013774432. Its totient is φ = 20700530104320.

The previous prime is 21365025136123. The next prime is 21365025136163. The reversal of 21365025136127 is 72163152056312.

It is a cyclic number.

It is not a de Polignac number, because 21365025136127 - 2² = 21365025136123 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 (21365025136123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223171823 + ... + 223267535.

It is an arithmetic number, because the mean of its divisors is an integer number (1377500860902).

Almost surely, 2^{21365025136127} is an apocalyptic number.

21365025136127 is a deficient number, since it is larger than the sum of its proper divisors (674988638305).

21365025136127 is an equidigital number, since it uses as much as digits as its factorization.

21365025136127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150458.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 21365025136127 in words is "twenty-one trillion, three hundred sixty-five billion, twenty-five million, one hundred thirty-six thousand, one hundred twenty-seven".