21131255024155 has 8 divisors (see below), whose sum is σ = 25357813304832. Its totient is φ = 16904799168768.

The previous prime is 21131255024147. The next prime is 21131255024183. The reversal of 21131255024155 is 55142055213112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21131255024155 - 2³ = 21131255024147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25151707 + ... + 25978276.

It is an arithmetic number, because the mean of its divisors is an integer number (3169726663104).

Almost surely, 2^{21131255024155} is an apocalyptic number.

21131255024155 is a deficient number, since it is larger than the sum of its proper divisors (4226558280677).

21131255024155 is an equidigital number, since it uses as much as digits as its factorization.

21131255024155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51212645.

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 21131255024155 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred fifty-five million, twenty-four thousand, one hundred fifty-five".