21766994 has 32 divisors (see below), whose sum is σ = 35244720. Its totient is φ = 10063872.

The previous prime is 21766981. The next prime is 21767029. The reversal of 21766994 is 49966712.

It can be written as a sum of positive squares in 8 ways, for example, as 13786369 + 7980625 = 3713^2 + 2825^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224354 + ... + 224450.

Almost surely, 2^21766994 is an apocalyptic number.

21766994 is a deficient number, since it is larger than the sum of its proper divisors (13477726).

21766994 is a wasteful number, since it uses less digits than its factorization.

21766994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254.

The product of its digits is 163296, while the sum is 44.

The square root of 21766994 is about 4665.5111188379. The cubic root of 21766994 is about 279.2111897306.

The spelling of 21766994 in words is "twenty-one million, seven hundred sixty-six thousand, nine hundred ninety-four".