21256044514331 has 8 divisors (see below), whose sum is σ = 23936425494528. Its totient is φ = 18700332417000.

The previous prime is 21256044514307. The next prime is 21256044514417. The reversal of 21256044514331 is 13341544065212.

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 21256044514331 - 2²² = 21256040320027 is a prime.

It is a super-2 number, since 2×21256044514331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21256044519331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31167220355 + ... + 31167221036.

It is an arithmetic number, because the mean of its divisors is an integer number (2992053186816).

Almost surely, 2^{21256044514331} is an apocalyptic number.

21256044514331 is a deficient number, since it is larger than the sum of its proper divisors (2680380980197).

21256044514331 is a wasteful number, since it uses less digits than its factorization.

21256044514331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62334441433.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 21256044514331 its reverse (13341544065212), we get a palindrome (34597588579543).

The spelling of 21256044514331 in words is "twenty-one trillion, two hundred fifty-six billion, forty-four million, five hundred fourteen thousand, three hundred thirty-one".