122787221 has 2 divisors, whose sum is σ = 122787222. Its totient is φ = 122787220.

The previous prime is 122787211. The next prime is 122787229.

122787221 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110460100 + 12327121 = 10510^2 + 3511^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 122787221 - 2⁶ = 122787157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122787229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61393610 + 61393611.

It is an arithmetic number, because the mean of its divisors is an integer number (61393611).

Almost surely, 2^122787221 is an apocalyptic number.

It is an amenable number.

122787221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122787221 is an equidigital number, since it uses as much as digits as its factorization.

122787221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

The square root of 122787221 is about 11080.9395359780. The cubic root of 122787221 is about 497.0320453490.

The spelling of 122787221 in words is "one hundred twenty-two million, seven hundred eighty-seven thousand, two hundred twenty-one".