22171290 has 64 divisors (see below), whose sum is σ = 56730240. Its totient is φ = 5529600.

The previous prime is 22171267. The next prime is 22171291. The reversal of 22171290 is 9217122.

It is a super-2 number, since 2×22171290² = 983132200528200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22171290.

It is not an unprimeable number, because it can be changed into a prime (22171291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55090 + ... + 55490.

It is an arithmetic number, because the mean of its divisors is an integer number (886410).

Almost surely, 2^22171290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22171290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28365120).

22171290 is an abundant number, since it is smaller than the sum of its proper divisors (34558950).

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

22171290 is a wasteful number, since it uses less digits than its factorization.

22171290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 22171290 is about 4708.6399310204. The cubic root of 22171290 is about 280.9292679627.

The spelling of 22171290 in words is "twenty-two million, one hundred seventy-one thousand, two hundred ninety".