22236681 has 4 divisors (see below), whose sum is σ = 29648912. Its totient is φ = 14824452.

The previous prime is 22236679. The next prime is 22236689. The reversal of 22236681 is 18663222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22236681 - 2¹ = 22236679 is a prime.

It is a super-2 number, since 2×22236681² = 988939963791522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22236689) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3706111 + ... + 3706116.

It is an arithmetic number, because the mean of its divisors is an integer number (7412228).

Almost surely, 2^22236681 is an apocalyptic number.

It is an amenable number.

22236681 is a deficient number, since it is larger than the sum of its proper divisors (7412231).

22236681 is an equidigital number, since it uses as much as digits as its factorization.

22236681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7412230.

The product of its digits is 6912, while the sum is 30.

The square root of 22236681 is about 4715.5785435087. The cubic root of 22236681 is about 281.2051835751.

The spelling of 22236681 in words is "twenty-two million, two hundred thirty-six thousand, six hundred eighty-one".