22908821 has 4 divisors (see below), whose sum is σ = 24671052. Its totient is φ = 21146592.

The previous prime is 22908799. The next prime is 22908839. The reversal of 22908821 is 12880922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3204100 + 19704721 = 1790^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 22908821 - 2⁶ = 22908757 is a prime.

It is a super-2 number, since 2×22908821² = 1049628159220082, 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 (22908871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881096 + ... + 881121.

It is an arithmetic number, because the mean of its divisors is an integer number (6167763).

Almost surely, 2^22908821 is an apocalyptic number.

It is an amenable number.

22908821 is a deficient number, since it is larger than the sum of its proper divisors (1762231).

22908821 is a wasteful number, since it uses less digits than its factorization.

22908821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762230.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 22908821 is about 4786.3160154758. The cubic root of 22908821 is about 284.0104018210.

It can be divided in two parts, 2290 and 8821, that added together give a palindrome (11111).

The spelling of 22908821 in words is "twenty-two million, nine hundred eight thousand, eight hundred twenty-one".