22117550 has 48 divisors (see below), whose sum is σ = 50642592. Its totient is φ = 6998400.

The previous prime is 22117549. The next prime is 22117553. The reversal of 22117550 is 5571122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22117553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2120 + ... + 6980.

It is an arithmetic number, because the mean of its divisors is an integer number (1055054).

Almost surely, 2^22117550 is an apocalyptic number.

22117550 is an abundant number, since it is smaller than the sum of its proper divisors (28525042).

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

22117550 is a wasteful number, since it uses less digits than its factorization.

22117550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893 (or 4888 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 22117550 is about 4702.9299378154. The cubic root of 22117550 is about 280.7021070251.

Adding to 22117550 its reverse (5571122), we get a palindrome (27688672).

It can be divided in two parts, 221 and 17550, that added together give a palindrome (17771).

The spelling of 22117550 in words is "twenty-two million, one hundred seventeen thousand, five hundred fifty".