21132431343 has 12 divisors (see below), whose sum is σ = 30597479640. Its totient is φ = 14054661456.

The previous prime is 21132431339. The next prime is 21132431357. The reversal of 21132431343 is 34313423112.

It is a happy number.

21132431343 is a `hidden beast` number, since 21 + 1 + 324 + 313 + 4 + 3 = 666.

It is not a de Polignac number, because 21132431343 - 2² = 21132431339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132431443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2798196 + ... + 2805737.

It is an arithmetic number, because the mean of its divisors is an integer number (2549789970).

Almost surely, 2^21132431343 is an apocalyptic number.

21132431343 is a deficient number, since it is larger than the sum of its proper divisors (9465048297).

21132431343 is a wasteful number, since it uses less digits than its factorization.

21132431343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5604358 (or 5604355 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21132431343 its reverse (34313423112), we get a palindrome (55445854455).

The spelling of 21132431343 in words is "twenty-one billion, one hundred thirty-two million, four hundred thirty-one thousand, three hundred forty-three".