21943198 has 16 divisors (see below), whose sum is σ = 34488000. Its totient is φ = 10456992.

The previous prime is 21943193. The next prime is 21943199. The reversal of 21943198 is 89134912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2188 + ... + 6976.

It is an arithmetic number, because the mean of its divisors is an integer number (2155500).

Almost surely, 2^21943198 is an apocalyptic number.

21943198 is a deficient number, since it is larger than the sum of its proper divisors (12544802).

21943198 is a wasteful number, since it uses less digits than its factorization.

21943198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899.

The product of its digits is 15552, while the sum is 37.

The square root of 21943198 is about 4684.3567327863. The cubic root of 21943198 is about 279.9625715277.

The spelling of 21943198 in words is "twenty-one million, nine hundred forty-three thousand, one hundred ninety-eight".