21431132331 has 32 divisors (see below), whose sum is σ = 34644630528. Its totient is φ = 11503764480.

The previous prime is 21431132321. The next prime is 21431132363. The reversal of 21431132331 is 13323113412.

It is not a de Polignac number, because 21431132331 - 2²¹ = 21429035179 is a prime.

It is a super-2 number, since 2×21431132331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21431132321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128386 + ... + 243608.

It is an arithmetic number, because the mean of its divisors is an integer number (1082644704).

Almost surely, 2^21431132331 is an apocalyptic number.

21431132331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21431132331 is a deficient number, since it is larger than the sum of its proper divisors (13213498197).

21431132331 is a wasteful number, since it uses less digits than its factorization.

21431132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115771.

The product of its digits is 1296, while the sum is 24.

Adding to 21431132331 its reverse (13323113412), we get a palindrome (34754245743).

It can be divided in two parts, 214311 and 32331, that added together give a palindrome (246642).

The spelling of 21431132331 in words is "twenty-one billion, four hundred thirty-one million, one hundred thirty-two thousand, three hundred thirty-one".