123021121 has 2 divisors, whose sum is σ = 123021122. Its totient is φ = 123021120.

The previous prime is 123021097. The next prime is 123021127. The reversal of 123021121 is 121120321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 5948721 = 10820^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 123021121 - 2²¹ = 120923969 is a prime.

It is not a weakly prime, because it can be changed into another prime (123021127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510560 + 61510561.

It is an arithmetic number, because the mean of its divisors is an integer number (61510561).

Almost surely, 2^123021121 is an apocalyptic number.

It is an amenable number.

123021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021121 is an equidigital number, since it uses as much as digits as its factorization.

123021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 123021121 is about 11091.4886737534. The cubic root of 123021121 is about 497.3474474815.

Adding to 123021121 its reverse (121120321), we get a palindrome (244141442).

The spelling of 123021121 in words is "one hundred twenty-three million, twenty-one thousand, one hundred twenty-one".