22021198 has 4 divisors (see below), whose sum is σ = 33031800. Its totient is φ = 11010598.

The previous prime is 22021177. The next prime is 22021211. The reversal of 22021198 is 89112022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89112022 = 2 ⋅44556011.

It is a super-2 number, since 2×22021198² = 969866322710408, 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 as a sum of consecutive naturals, namely, 5505298 + ... + 5505301.

It is an arithmetic number, because the mean of its divisors is an integer number (8257950).

Almost surely, 2^22021198 is an apocalyptic number.

22021198 is a deficient number, since it is larger than the sum of its proper divisors (11010602).

22021198 is a wasteful number, since it uses less digits than its factorization.

22021198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010601.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 22021198 is about 4692.6749301438. The cubic root of 22021198 is about 280.2939005845.

The spelling of 22021198 in words is "twenty-two million, twenty-one thousand, one hundred ninety-eight".