21929392 has 10 divisors (see below), whose sum is σ = 42488228. Its totient is φ = 10964688.

The previous prime is 21929389. The next prime is 21929393. The reversal of 21929392 is 29392912.

It is not an unprimeable number, because it can be changed into a prime (21929393) by changing a digit.

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, 685278 + ... + 685309.

Almost surely, 2^21929392 is an apocalyptic number.

It is an amenable number.

21929392 is a deficient number, since it is larger than the sum of its proper divisors (20558836).

21929392 is a wasteful number, since it uses less digits than its factorization.

21929392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370595 (or 1370589 counting only the distinct ones).

The product of its digits is 17496, while the sum is 37.

The square root of 21929392 is about 4682.8828727612. The cubic root of 21929392 is about 279.9038445338.

The spelling of 21929392 in words is "twenty-one million, nine hundred twenty-nine thousand, three hundred ninety-two".