122531221 has 2 divisors, whose sum is σ = 122531222. Its totient is φ = 122531220.

The previous prime is 122531219. The next prime is 122531239. The reversal of 122531221 is 122135221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89984196 + 32547025 = 9486^2 + 5705^2 .

It is a cyclic number.

It is not a de Polignac number, because 122531221 - 2¹ = 122531219 is a prime.

Together with 122531219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122535221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61265610 + 61265611.

It is an arithmetic number, because the mean of its divisors is an integer number (61265611).

Almost surely, 2^122531221 is an apocalyptic number.

It is an amenable number.

122531221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122531221 is an equidigital number, since it uses as much as digits as its factorization.

122531221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 122531221 is about 11069.3821417458. The cubic root of 122531221 is about 496.6863830639.

Adding to 122531221 its reverse (122135221), we get a palindrome (244666442).

The spelling of 122531221 in words is "one hundred twenty-two million, five hundred thirty-one thousand, two hundred twenty-one".