22121343221 has 2 divisors, whose sum is σ = 22121343222. Its totient is φ = 22121343220.

The previous prime is 22121343203. The next prime is 22121343229. The reversal of 22121343221 is 12234312122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22049280100 + 72063121 = 148490^2 + 8489^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121343221 - 2⁶ = 22121343157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121343229) 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 as a sum of consecutive naturals, namely, 11060671610 + 11060671611.

It is an arithmetic number, because the mean of its divisors is an integer number (11060671611).

Almost surely, 2^22121343221 is an apocalyptic number.

It is an amenable number.

22121343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121343221 is an equidigital number, since it uses as much as digits as its factorization.

22121343221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

Adding to 22121343221 its reverse (12234312122), we get a palindrome (34355655343).

The spelling of 22121343221 in words is "twenty-two billion, one hundred twenty-one million, three hundred forty-three thousand, two hundred twenty-one".