21866694 has 32 divisors (see below), whose sum is σ = 45287424. Its totient is φ = 7033920.

The previous prime is 21866693. The next prime is 21866699. The reversal of 21866694 is 49666812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21866693) 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, 24907 + ... + 25769.

It is an arithmetic number, because the mean of its divisors is an integer number (1415232).

Almost surely, 2^21866694 is an apocalyptic number.

21866694 is an abundant number, since it is smaller than the sum of its proper divisors (23420730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21866694 is a wasteful number, since it uses less digits than its factorization.

21866694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012.

The product of its digits is 124416, while the sum is 42.

The square root of 21866694 is about 4676.1837004121. The cubic root of 21866694 is about 279.6368335903.

The spelling of 21866694 in words is "twenty-one million, eight hundred sixty-six thousand, six hundred ninety-four".