122154321221 has 2 divisors, whose sum is σ = 122154321222. Its totient is φ = 122154321220.

The previous prime is 122154321193. The next prime is 122154321241. The reversal of 122154321221 is 122123451221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121791228196 + 363093025 = 348986^2 + 19055^2 .

It is a cyclic number.

It is not a de Polignac number, because 122154321221 - 2¹⁴ = 122154304837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122154321241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61077160610 + 61077160611.

It is an arithmetic number, because the mean of its divisors is an integer number (61077160611).

Almost surely, 2^122154321221 is an apocalyptic number.

It is an amenable number.

122154321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122154321221 is an equidigital number, since it uses as much as digits as its factorization.

122154321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

Adding to 122154321221 its reverse (122123451221), we get a palindrome (244277772442).

The spelling of 122154321221 in words is "one hundred twenty-two billion, one hundred fifty-four million, three hundred twenty-one thousand, two hundred twenty-one".