21331191342 has 32 divisors (see below), whose sum is σ = 43034004000. Its totient is φ = 7048650368.

The previous prime is 21331191341. The next prime is 21331191379. The reversal of 21331191342 is 24319113312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331191341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431608 + ... + 478484.

It is an arithmetic number, because the mean of its divisors is an integer number (1344812625).

Almost surely, 2^21331191342 is an apocalyptic number.

21331191342 is an abundant number, since it is smaller than the sum of its proper divisors (21702812658).

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

21331191342 is a wasteful number, since it uses less digits than its factorization.

21331191342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47540.

The product of its digits is 3888, while the sum is 30.

The spelling of 21331191342 in words is "twenty-one billion, three hundred thirty-one million, one hundred ninety-one thousand, three hundred forty-two".