21137942 has 16 divisors (see below), whose sum is σ = 36675072. Its totient is φ = 8949480.

The previous prime is 21137929. The next prime is 21137959. The reversal of 21137942 is 24973112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7934 + ... + 10257.

It is an arithmetic number, because the mean of its divisors is an integer number (2292192).

Almost surely, 2^21137942 is an apocalyptic number.

21137942 is a deficient number, since it is larger than the sum of its proper divisors (15537130).

21137942 is a wasteful number, since it uses less digits than its factorization.

21137942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18283.

The product of its digits is 3024, while the sum is 29.

The square root of 21137942 is about 4597.6017661385. The cubic root of 21137942 is about 276.4951815490.

The spelling of 21137942 in words is "twenty-one million, one hundred thirty-seven thousand, nine hundred forty-two".