21131324044331 has 8 divisors (see below), whose sum is σ = 21740582304480. Its totient is φ = 20524073226048.

The previous prime is 21131324044273. The next prime is 21131324044333. The reversal of 21131324044331 is 13344042313112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21131324044331 is a prime.

It is a super-2 number, since 2×21131324044331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131324044333) 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, 501839111 + ... + 501881216.

It is an arithmetic number, because the mean of its divisors is an integer number (2717572788060).

Almost surely, 2^{21131324044331} is an apocalyptic number.

21131324044331 is a deficient number, since it is larger than the sum of its proper divisors (609258260149).

21131324044331 is a wasteful number, since it uses less digits than its factorization.

21131324044331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003720933.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 21131324044331 its reverse (13344042313112), we get a palindrome (34475366357443).

The spelling of 21131324044331 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred twenty-four million, forty-four thousand, three hundred thirty-one".