21967850 has 12 divisors (see below), whose sum is σ = 40860294. Its totient is φ = 8787120.

The previous prime is 21967837. The next prime is 21967853. The reversal of 21967850 is 5876912.

It can be written as a sum of positive squares in 3 ways, for example, as 9443329 + 12524521 = 3073^2 + 3539^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21967853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219629 + ... + 219728.

Almost surely, 2^21967850 is an apocalyptic number.

21967850 is a deficient number, since it is larger than the sum of its proper divisors (18892444).

21967850 is a wasteful number, since it uses less digits than its factorization.

21967850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439369 (or 439364 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 21967850 is about 4686.9873052954. The cubic root of 21967850 is about 280.0673732432.

The spelling of 21967850 in words is "twenty-one million, nine hundred sixty-seven thousand, eight hundred fifty".