21250608 has 20 divisors (see below), whose sum is σ = 54897528. Its totient is φ = 7083520.

The previous prime is 21250589. The next prime is 21250637. The reversal of 21250608 is 80605212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221313 + ... + 221408.

Almost surely, 2^21250608 is an apocalyptic number.

It is an amenable number.

21250608 is an abundant number, since it is smaller than the sum of its proper divisors (33646920).

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

21250608 is a wasteful number, since it uses less digits than its factorization.

21250608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442732 (or 442726 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21250608 is about 4609.8381750339. The cubic root of 21250608 is about 276.9855544692.

The spelling of 21250608 in words is "twenty-one million, two hundred fifty thousand, six hundred eight".