22124221421 has 2 divisors, whose sum is σ = 22124221422. Its totient is φ = 22124221420.

The previous prime is 22124221417. The next prime is 22124221451. The reversal of 22124221421 is 12412242122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21422713225 + 701508196 = 146365^2 + 26486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22124221421 - 2² = 22124221417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22124221451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11062110710 + 11062110711.

It is an arithmetic number, because the mean of its divisors is an integer number (11062110711).

Almost surely, 2^22124221421 is an apocalyptic number.

It is an amenable number.

22124221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22124221421 is an equidigital number, since it uses as much as digits as its factorization.

22124221421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024, while the sum is 23.

Adding to 22124221421 its reverse (12412242122), we get a palindrome (34536463543).

The spelling of 22124221421 in words is "twenty-two billion, one hundred twenty-four million, two hundred twenty-one thousand, four hundred twenty-one".