21331342 has 8 divisors (see below), whose sum is σ = 32356800. Its totient is φ = 10545744.

The previous prime is 21331339. The next prime is 21331361. The reversal of 21331342 is 24313312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59742 + ... + 60097.

It is an arithmetic number, because the mean of its divisors is an integer number (4044600).

Almost surely, 2^21331342 is an apocalyptic number.

21331342 is a deficient number, since it is larger than the sum of its proper divisors (11025458).

21331342 is a wasteful number, since it uses less digits than its factorization.

21331342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119930.

The product of its digits is 432, while the sum is 19.

The square root of 21331342 is about 4618.5865803295. The cubic root of 21331342 is about 277.3358800129.

Adding to 21331342 its reverse (24313312), we get a palindrome (45644654).

The spelling of 21331342 in words is "twenty-one million, three hundred thirty-one thousand, three hundred forty-two".