21694966 has 4 divisors (see below), whose sum is σ = 32542452. Its totient is φ = 10847482.

The previous prime is 21694951. The next prime is 21694991. The reversal of 21694966 is 66949612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5423740 + ... + 5423743.

It is an arithmetic number, because the mean of its divisors is an integer number (8135613).

Almost surely, 2^21694966 is an apocalyptic number.

21694966 is a deficient number, since it is larger than the sum of its proper divisors (10847486).

21694966 is a wasteful number, since it uses less digits than its factorization.

21694966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10847485.

The product of its digits is 139968, while the sum is 43.

The square root of 21694966 is about 4657.7855253328. The cubic root of 21694966 is about 278.9028751142.

The spelling of 21694966 in words is "twenty-one million, six hundred ninety-four thousand, nine hundred sixty-six".