21598902 has 48 divisors (see below), whose sum is σ = 50738688. Its totient is φ = 6600960.

The previous prime is 21598901. The next prime is 21598919. The reversal of 21598902 is 20989512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21598901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56203 + ... + 56585.

It is an arithmetic number, because the mean of its divisors is an integer number (1057056).

Almost surely, 2^21598902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21598902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25369344).

21598902 is an abundant number, since it is smaller than the sum of its proper divisors (29139786).

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

21598902 is a wasteful number, since it uses less digits than its factorization.

21598902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 21598902 is about 4647.4618879556. The cubic root of 21598902 is about 278.4906109882.

It can be divided in two parts, 21598 and 902, that added together give a square (22500 = 150²).

The spelling of 21598902 in words is "twenty-one million, five hundred ninety-eight thousand, nine hundred two".