22721886 has 24 divisors (see below), whose sum is σ = 53706744. Its totient is φ = 6885360.

The previous prime is 22721873. The next prime is 22721893. The reversal of 22721886 is 68812722.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22721886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57181 + ... + 57576.

It is an arithmetic number, because the mean of its divisors is an integer number (2237781).

Almost surely, 2^22721886 is an apocalyptic number.

22721886 is an abundant number, since it is smaller than the sum of its proper divisors (30984858).

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

22721886 is a wasteful number, since it uses less digits than its factorization.

22721886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114776 (or 114773 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 22721886 is about 4766.7479480249. The cubic root of 22721886 is about 283.2357867971.

The spelling of 22721886 in words is "twenty-two million, seven hundred twenty-one thousand, eight hundred eighty-six".