21338898 has 32 divisors (see below), whose sum is σ = 49580160. Its totient is φ = 5996160.

The previous prime is 21338873. The next prime is 21338929. The reversal of 21338898 is 89883312.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1603 + ... + 6726.

It is an arithmetic number, because the mean of its divisors is an integer number (1549380).

Almost surely, 2^21338898 is an apocalyptic number.

21338898 is an abundant number, since it is smaller than the sum of its proper divisors (28241262).

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

21338898 is a wasteful number, since it uses less digits than its factorization.

21338898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8402.

The product of its digits is 82944, while the sum is 42.

The square root of 21338898 is about 4619.4045070766. The cubic root of 21338898 is about 277.3686221712.

The spelling of 21338898 in words is "twenty-one million, three hundred thirty-eight thousand, eight hundred ninety-eight".