21210431442 has 32 divisors (see below), whose sum is σ = 43155763200. Its totient is φ = 6947749008.

The previous prime is 21210431419. The next prime is 21210431453. The reversal of 21210431442 is 24413401212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1111659 + ... + 1130577.

It is an arithmetic number, because the mean of its divisors is an integer number (1348617600).

Almost surely, 2^21210431442 is an apocalyptic number.

21210431442 is an abundant number, since it is smaller than the sum of its proper divisors (21945331758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210431442 is a wasteful number, since it uses less digits than its factorization.

21210431442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22150.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21210431442 its reverse (24413401212), we get a palindrome (45623832654).

The spelling of 21210431442 in words is "twenty-one billion, two hundred ten million, four hundred thirty-one thousand, four hundred forty-two".