22236881 has 12 divisors (see below), whose sum is σ = 23318412. Its totient is φ = 21202944.

The previous prime is 22236853. The next prime is 22236887. The reversal of 22236881 is 18863222.

It can be written as a sum of positive squares in 6 ways, for example, as 99856 + 22137025 = 316^2 + 4705^2 .

It is not a de Polignac number, because 22236881 - 2⁶ = 22236817 is a prime.

It is a super-2 number, since 2×22236881² = 988957753216322, 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 (22236887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115121 + ... + 115313.

It is an arithmetic number, because the mean of its divisors is an integer number (1943201).

Almost surely, 2^22236881 is an apocalyptic number.

It is an amenable number.

22236881 is a deficient number, since it is larger than the sum of its proper divisors (1081531).

22236881 is a wasteful number, since it uses less digits than its factorization.

22236881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 359 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 22236881 is about 4715.5997497667. The cubic root of 22236881 is about 281.2060266395.

The spelling of 22236881 in words is "twenty-two million, two hundred thirty-six thousand, eight hundred eighty-one".