22650821 has 4 divisors (see below), whose sum is σ = 22689612. Its totient is φ = 22612032.

The previous prime is 22650799. The next prime is 22650841. The reversal of 22650821 is 12805622.

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 10824100 + 11826721 = 3290^2 + 3439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22650821 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 (22650841) 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, 18506 + ... + 19691.

It is an arithmetic number, because the mean of its divisors is an integer number (5672403).

Almost surely, 2^22650821 is an apocalyptic number.

It is an amenable number.

22650821 is a deficient number, since it is larger than the sum of its proper divisors (38791).

22650821 is an equidigital number, since it uses as much as digits as its factorization.

22650821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38790.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 22650821 is about 4759.2878668977. The cubic root of 22650821 is about 282.9401955479.

The spelling of 22650821 in words is "twenty-two million, six hundred fifty thousand, eight hundred twenty-one".