22896821 has 4 divisors (see below), whose sum is σ = 23515692. Its totient is φ = 22277952.

The previous prime is 22896787. The next prime is 22896829. The reversal of 22896821 is 12869822.

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 10329796 + 12567025 = 3214^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 22896821 - 2¹⁰ = 22895797 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 (22896829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309380 + ... + 309453.

It is an arithmetic number, because the mean of its divisors is an integer number (5878923).

Almost surely, 2^22896821 is an apocalyptic number.

It is an amenable number.

22896821 is a deficient number, since it is larger than the sum of its proper divisors (618871).

22896821 is an equidigital number, since it uses as much as digits as its factorization.

22896821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618870.

The product of its digits is 27648, while the sum is 38.

The square root of 22896821 is about 4785.0622775467. The cubic root of 22896821 is about 283.9608034578.

The spelling of 22896821 in words is "twenty-two million, eight hundred ninety-six thousand, eight hundred twenty-one".