123455622221 has 2 divisors, whose sum is σ = 123455622222. Its totient is φ = 123455622220.

The previous prime is 123455622203. The next prime is 123455622223. The reversal of 123455622221 is 122226554321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113064062500 + 10391559721 = 336250^2 + 101939^2 .

It is a cyclic number.

It is not a de Polignac number, because 123455622221 - 2²⁶ = 123388513357 is a prime.

Together with 123455622223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123455622223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61727811110 + 61727811111.

It is an arithmetic number, because the mean of its divisors is an integer number (61727811111).

Almost surely, 2^123455622221 is an apocalyptic number.

It is an amenable number.

123455622221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123455622221 is an equidigital number, since it uses as much as digits as its factorization.

123455622221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 35.

The spelling of 123455622221 in words is "one hundred twenty-three billion, four hundred fifty-five million, six hundred twenty-two thousand, two hundred twenty-one".