22171830 has 16 divisors (see below), whose sum is σ = 53212464. Its totient is φ = 5912480.

The previous prime is 22171829. The next prime is 22171867. The reversal of 22171830 is 3817122.

It is a self number, because there is not a number n which added to its sum of digits gives 22171830.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369501 + ... + 369560.

It is an arithmetic number, because the mean of its divisors is an integer number (3325779).

Almost surely, 2^22171830 is an apocalyptic number.

22171830 is an abundant number, since it is smaller than the sum of its proper divisors (31040634).

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

22171830 is a wasteful number, since it uses less digits than its factorization.

22171830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739071.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 22171830 is about 4708.6972720701. The cubic root of 22171830 is about 280.9315486986.

Adding to 22171830 its reverse (3817122), we get a palindrome (25988952).

The spelling of 22171830 in words is "twenty-two million, one hundred seventy-one thousand, eight hundred thirty".