22541821 has 4 divisors (see below), whose sum is σ = 22658812. Its totient is φ = 22424832.

The previous prime is 22541807. The next prime is 22541833. The reversal of 22541821 is 12814522.

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 7214596 + 15327225 = 2686^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 22541821 - 2⁵ = 22541789 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 (22541891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58206 + ... + 58591.

It is an arithmetic number, because the mean of its divisors is an integer number (5664703).

Almost surely, 2^22541821 is an apocalyptic number.

It is an amenable number.

22541821 is a deficient number, since it is larger than the sum of its proper divisors (116991).

22541821 is a wasteful number, since it uses less digits than its factorization.

22541821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116990.

The product of its digits is 1280, while the sum is 25.

The square root of 22541821 is about 4747.8227641731. The cubic root of 22541821 is about 282.4856118184.

The spelling of 22541821 in words is "twenty-two million, five hundred forty-one thousand, eight hundred twenty-one".