21854198 has 16 divisors (see below), whose sum is σ = 33841584. Its totient is φ = 10576800.

The previous prime is 21854171. The next prime is 21854207. The reversal of 21854198 is 89145812.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16148 + ... + 17448.

It is an arithmetic number, because the mean of its divisors is an integer number (2115099).

Almost surely, 2^21854198 is an apocalyptic number.

21854198 is a deficient number, since it is larger than the sum of its proper divisors (11987386).

21854198 is a wasteful number, since it uses less digits than its factorization.

21854198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567.

The product of its digits is 23040, while the sum is 38.

The square root of 21854198 is about 4674.8473771878. The cubic root of 21854198 is about 279.5835561003.

The spelling of 21854198 in words is "twenty-one million, eight hundred fifty-four thousand, one hundred ninety-eight".