21966994 has 12 divisors (see below), whose sum is σ = 38330334. Its totient is φ = 9414384.

The previous prime is 21966961. The next prime is 21967019. The reversal of 21966994 is 49966912.

It can be written as a sum of positive squares in only one way, i.e., 12694969 + 9272025 = 3563^2 + 3045^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111979 + ... + 112174.

Almost surely, 2^21966994 is an apocalyptic number.

21966994 is a deficient number, since it is larger than the sum of its proper divisors (16363340).

21966994 is a wasteful number, since it uses less digits than its factorization.

21966994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224169 (or 224162 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 21966994 is about 4686.8959877514. The cubic root of 21966994 is about 280.0637354910.

The spelling of 21966994 in words is "twenty-one million, nine hundred sixty-six thousand, nine hundred ninety-four".