22181357 has 6 divisors (see below), whose sum is σ = 24381294. Its totient is φ = 20164760.

The previous prime is 22181347. The next prime is 22181363. The reversal of 22181357 is 75318122.

It can be written as a sum of positive squares in only one way, i.e., 13097161 + 9084196 = 3619^2 + 3014^2 .

It is not a de Polignac number, because 22181357 - 2⁶ = 22181293 is a prime.

It is a super-2 number, since 2×22181357² = 984025196722898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22181347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91538 + ... + 91779.

It is an arithmetic number, because the mean of its divisors is an integer number (4063549).

Almost surely, 2^22181357 is an apocalyptic number.

It is an amenable number.

22181357 is a deficient number, since it is larger than the sum of its proper divisors (2199937).

22181357 is a wasteful number, since it uses less digits than its factorization.

22181357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183339 (or 183328 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 22181357 is about 4709.7088020386. The cubic root of 22181357 is about 280.9717807049.

Adding to 22181357 its reverse (75318122), we get a palindrome (97499479).

The spelling of 22181357 in words is "twenty-two million, one hundred eighty-one thousand, three hundred fifty-seven".