22451221421 has 8 divisors (see below), whose sum is σ = 23455359000. Its totient is φ = 21462414400.

The previous prime is 22451221399. The next prime is 22451221469. The reversal of 22451221421 is 12412215422.

It can be written as a sum of positive squares in 4 ways, for example, as 11344380100 + 11106841321 = 106510^2 + 105389^2 .

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 22451221421 - 2¹⁸ = 22450959277 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 (22451224421) 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 7 ways as a sum of consecutive naturals, for example, 3829646 + ... + 3835503.

It is an arithmetic number, because the mean of its divisors is an integer number (2931919875).

Almost surely, 2^22451221421 is an apocalyptic number.

It is an amenable number.

22451221421 is a deficient number, since it is larger than the sum of its proper divisors (1004137579).

22451221421 is a wasteful number, since it uses less digits than its factorization.

22451221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7665279.

The product of its digits is 2560, while the sum is 26.

Adding to 22451221421 its reverse (12412215422), we get a palindrome (34863436843).

The spelling of 22451221421 in words is "twenty-two billion, four hundred fifty-one million, two hundred twenty-one thousand, four hundred twenty-one".