21964396 has 12 divisors (see below), whose sum is σ = 38741248. Its totient is φ = 10895472.

The previous prime is 21964387. The next prime is 21964417. The reversal of 21964396 is 69346912.

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 in 3 ways as a sum of consecutive naturals, for example, 21111 + ... + 22126.

Almost surely, 2^21964396 is an apocalyptic number.

It is an amenable number.

21964396 is a deficient number, since it is larger than the sum of its proper divisors (16776852).

21964396 is a wasteful number, since it uses less digits than its factorization.

21964396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43368 (or 43366 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 21964396 is about 4686.6188238430. The cubic root of 21964396 is about 280.0526941643.

The spelling of 21964396 in words is "twenty-one million, nine hundred sixty-four thousand, three hundred ninety-six".