21003198 has 24 divisors (see below), whose sum is σ = 43189272. Its totient is φ = 6809184.

The previous prime is 21003179. The next prime is 21003223. The reversal of 21003198 is 89130012.

It is a super-2 number, since 2×21003198² = 882268652454408, which contains 22 as substring.

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, 6936 + ... + 9492.

It is an arithmetic number, because the mean of its divisors is an integer number (1799553).

Almost surely, 2^21003198 is an apocalyptic number.

21003198 is an abundant number, since it is smaller than the sum of its proper divisors (22186074).

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

21003198 is a wasteful number, since it uses less digits than its factorization.

21003198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636 (or 2599 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21003198 is about 4582.9246120791. The cubic root of 21003198 is about 275.9064217519.

The spelling of 21003198 in words is "twenty-one million, three thousand, one hundred ninety-eight".