21431032042 has 16 divisors (see below), whose sum is σ = 37593306432. Its totient is φ = 8971129440.

The previous prime is 21431032039. The next prime is 21431032043. The reversal of 21431032042 is 24023013412.

It is not an unprimeable number, because it can be changed into a prime (21431032043) 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, 17799259 + ... + 17800462.

It is an arithmetic number, because the mean of its divisors is an integer number (2349581652).

Almost surely, 2^21431032042 is an apocalyptic number.

21431032042 is a deficient number, since it is larger than the sum of its proper divisors (16162274390).

21431032042 is a wasteful number, since it uses less digits than its factorization.

21431032042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35599773.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21431032042 its reverse (24023013412), we get a palindrome (45454045454).

The spelling of 21431032042 in words is "twenty-one billion, four hundred thirty-one million, thirty-two thousand, forty-two".