21131514331 has 4 divisors (see below), whose sum is σ = 21131846064. Its totient is φ = 21131182600.

The previous prime is 21131514329. The next prime is 21131514353. The reversal of 21131514331 is 13341513112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21131514331 - 2¹ = 21131514329 is a prime.

It is a super-2 number, since 2×21131514331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131514296 and 21131514305.

It is not an unprimeable number, because it can be changed into a prime (21131514931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36880 + ... + 208861.

It is an arithmetic number, because the mean of its divisors is an integer number (5282961516).

Almost surely, 2^21131514331 is an apocalyptic number.

21131514331 is a deficient number, since it is larger than the sum of its proper divisors (331733).

21131514331 is an equidigital number, since it uses as much as digits as its factorization.

21131514331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331732.

The product of its digits is 1080, while the sum is 25.

The spelling of 21131514331 in words is "twenty-one billion, one hundred thirty-one million, five hundred fourteen thousand, three hundred thirty-one".