21930336 has 36 divisors (see below), whose sum is σ = 62365212. Its totient is φ = 7310016.

The previous prime is 21930329. The next prime is 21930347. The reversal of 21930336 is 63303912.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37786 + ... + 38361.

It is an arithmetic number, because the mean of its divisors is an integer number (1732367).

Almost surely, 2^21930336 is an apocalyptic number.

It is an amenable number.

21930336 is an abundant number, since it is smaller than the sum of its proper divisors (40434876).

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

21930336 is a wasteful number, since it uses less digits than its factorization.

21930336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76163 (or 76152 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 21930336 is about 4682.9836642893. The cubic root of 21930336 is about 279.9078608397.

The spelling of 21930336 in words is "twenty-one million, nine hundred thirty thousand, three hundred thirty-six".