21822190 has 16 divisors (see below), whose sum is σ = 42301728. Its totient is φ = 8057376.

The previous prime is 21822173. The next prime is 21822197. The reversal of 21822190 is 9122812.

It is a super-2 number, since 2×21822190² = 952415952792200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822197) 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, 83802 + ... + 84061.

It is an arithmetic number, because the mean of its divisors is an integer number (2643858).

Almost surely, 2^21822190 is an apocalyptic number.

21822190 is a deficient number, since it is larger than the sum of its proper divisors (20479538).

21822190 is a wasteful number, since it uses less digits than its factorization.

21822190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167883.

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

The square root of 21822190 is about 4671.4226954965. The cubic root of 21822190 is about 279.4469952600.

The spelling of 21822190 in words is "twenty-one million, eight hundred twenty-two thousand, one hundred ninety".