21937814 has 32 divisors (see below), whose sum is σ = 35804160. Its totient is φ = 10055232.

The previous prime is 21937807. The next prime is 21937819. The reversal of 21937814 is 41873912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937819) 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, 157757 + ... + 157895.

It is an arithmetic number, because the mean of its divisors is an integer number (1118880).

Almost surely, 2^21937814 is an apocalyptic number.

21937814 is a deficient number, since it is larger than the sum of its proper divisors (13866346).

21937814 is a wasteful number, since it uses less digits than its factorization.

21937814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284.

The product of its digits is 12096, while the sum is 35.

The square root of 21937814 is about 4683.7820188390. The cubic root of 21937814 is about 279.9396723771.

The spelling of 21937814 in words is "twenty-one million, nine hundred thirty-seven thousand, eight hundred fourteen".