22444213451221 has 2 divisors, whose sum is σ = 22444213451222. Its totient is φ = 22444213451220.

The previous prime is 22444213451171. The next prime is 22444213451237. The reversal of 22444213451221 is 12215431244422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17242342712100 + 5201870739121 = 4152390^2 + 2280761^2 .

It is a cyclic number.

It is not a de Polignac number, because 22444213451221 - 2¹⁵ = 22444213418453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22444213451251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11222106725610 + 11222106725611.

It is an arithmetic number, because the mean of its divisors is an integer number (11222106725611).

Almost surely, 2^{22444213451221} is an apocalyptic number.

It is an amenable number.

22444213451221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22444213451221 is an equidigital number, since it uses as much as digits as its factorization.

22444213451221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122880, while the sum is 37.

Adding to 22444213451221 its reverse (12215431244422), we get a palindrome (34659644695643).

The spelling of 22444213451221 in words is "twenty-two trillion, four hundred forty-four billion, two hundred thirteen million, four hundred fifty-one thousand, two hundred twenty-one".