2211223311221 has 2 divisors, whose sum is σ = 2211223311222. Its totient is φ = 2211223311220.

The previous prime is 2211223311181. The next prime is 2211223311233. The reversal of 2211223311221 is 1221133221122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2188831480900 + 22391830321 = 1479470^2 + 149639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211223311221 - 2²⁶ = 2211156202357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211223311251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105611655610 + 1105611655611.

It is an arithmetic number, because the mean of its divisors is an integer number (1105611655611).

Almost surely, 2^{2211223311221} is an apocalyptic number.

It is an amenable number.

2211223311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211223311221 is an equidigital number, since it uses as much as digits as its factorization.

2211223311221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 2211223311221 its reverse (1221133221122), we get a palindrome (3432356532343).

Subtracting from 2211223311221 its reverse (1221133221122), we obtain a palindrome (990090090099).

The spelling of 2211223311221 in words is "two trillion, two hundred eleven billion, two hundred twenty-three million, three hundred eleven thousand, two hundred twenty-one".