22449821 has 4 divisors (see below), whose sum is σ = 22474332. Its totient is φ = 22425312.

The previous prime is 22449803. The next prime is 22449829. The reversal of 22449821 is 12894422.

It is a happy number.

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 2992900 + 19456921 = 1730^2 + 4411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22449821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22449829) 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, 10826 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (5618583).

Almost surely, 2^22449821 is an apocalyptic number.

It is an amenable number.

22449821 is a deficient number, since it is larger than the sum of its proper divisors (24511).

22449821 is an equidigital number, since it uses as much as digits as its factorization.

22449821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24510.

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

The square root of 22449821 is about 4738.1242068988. The cubic root of 22449821 is about 282.1007846926.

The spelling of 22449821 in words is "twenty-two million, four hundred forty-nine thousand, eight hundred twenty-one".