21190608 has 120 divisors (see below), whose sum is σ = 63138816. Its totient is φ = 6624000.

The previous prime is 21190591. The next prime is 21190621. The reversal of 21190608 is 80609112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209758 + ... + 209858.

Almost surely, 2^21190608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21190608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31569408).

21190608 is an abundant number, since it is smaller than the sum of its proper divisors (41948208).

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

21190608 is a wasteful number, since it uses less digits than its factorization.

21190608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 21190608 is about 4603.3257542781. The cubic root of 21190608 is about 276.7246239123.

The spelling of 21190608 in words is "twenty-one million, one hundred ninety thousand, six hundred eight".