22531821 has 8 divisors (see below), whose sum is σ = 32353440. Its totient is φ = 13865712.

The previous prime is 22531819. The next prime is 22531829. The reversal of 22531821 is 12813522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22531821 - 2¹ = 22531819 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22531791 and 22531800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22531829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288831 + ... + 288908.

It is an arithmetic number, because the mean of its divisors is an integer number (4044180).

Almost surely, 2^22531821 is an apocalyptic number.

It is an amenable number.

22531821 is a deficient number, since it is larger than the sum of its proper divisors (9821619).

22531821 is a wasteful number, since it uses less digits than its factorization.

22531821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577755.

The product of its digits is 960, while the sum is 24.

The square root of 22531821 is about 4746.7695330614. The cubic root of 22531821 is about 282.4438335619.

The spelling of 22531821 in words is "twenty-two million, five hundred thirty-one thousand, eight hundred twenty-one".