21668350 has 24 divisors (see below), whose sum is σ = 43968168. Its totient is φ = 7879200.

The previous prime is 21668327. The next prime is 21668389. The reversal of 21668350 is 5386612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19149 + ... + 20248.

It is an arithmetic number, because the mean of its divisors is an integer number (1832007).

Almost surely, 2^21668350 is an apocalyptic number.

21668350 is an abundant number, since it is smaller than the sum of its proper divisors (22299818).

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

21668350 is a wasteful number, since it uses less digits than its factorization.

21668350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39420 (or 39415 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21668350 is about 4654.9274967501. The cubic root of 21668350 is about 278.7887731194.

The spelling of 21668350 in words is "twenty-one million, six hundred sixty-eight thousand, three hundred fifty".