21912296 has 16 divisors (see below), whose sum is σ = 46955040. Its totient is φ = 9390960.

The previous prime is 21912287. The next prime is 21912311. The reversal of 21912296 is 69221912.

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, 195590 + ... + 195701.

It is an arithmetic number, because the mean of its divisors is an integer number (2934690).

Almost surely, 2^21912296 is an apocalyptic number.

It is an amenable number.

21912296 is an abundant number, since it is smaller than the sum of its proper divisors (25042744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21912296 is a wasteful number, since it uses less digits than its factorization.

21912296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391304 (or 391300 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 21912296 is about 4681.0571455602. The cubic root of 21912296 is about 279.8310886000.

The spelling of 21912296 in words is "twenty-one million, nine hundred twelve thousand, two hundred ninety-six".