22561312021 has 8 divisors (see below), whose sum is σ = 22985684640. Its totient is φ = 22138338768.

The previous prime is 22561312013. The next prime is 22561312057. The reversal of 22561312021 is 12021316522.

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

It is a cyclic number.

It is not a de Polignac number, because 22561312021 - 2³ = 22561312013 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 (22561312001) 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 7 ways as a sum of consecutive naturals, for example, 317266 + ... + 381811.

It is an arithmetic number, because the mean of its divisors is an integer number (2873210580).

Almost surely, 2^22561312021 is an apocalyptic number.

It is an amenable number.

22561312021 is a deficient number, since it is larger than the sum of its proper divisors (424372619).

22561312021 is an equidigital number, since it uses as much as digits as its factorization.

22561312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699683.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 22561312021 its reverse (12021316522), we get a palindrome (34582628543).

The spelling of 22561312021 in words is "twenty-two billion, five hundred sixty-one million, three hundred twelve thousand, twenty-one".