21683942 has 32 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 8461440.

The previous prime is 21683941. The next prime is 21683951. The reversal of 21683942 is 24938612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683941) 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, 5909 + ... + 8847.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^21683942 is an apocalyptic number.

21683942 is a deficient number, since it is larger than the sum of its proper divisors (18958618).

21683942 is a wasteful number, since it uses less digits than its factorization.

21683942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996.

The product of its digits is 20736, while the sum is 35.

The square root of 21683942 is about 4656.6019799850. The cubic root of 21683942 is about 278.8556268844.

The spelling of 21683942 in words is "twenty-one million, six hundred eighty-three thousand, nine hundred forty-two".