122921 has 2 divisors, whose sum is σ = 122922. Its totient is φ = 122920.

The previous prime is 122891. The next prime is 122929. The reversal of 122921 is 129221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 44521 = 280^2 + 211^2 .

It is an emirp because it is prime and its reverse (129221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122921 - 2¹⁴ = 106537 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122921.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 122921.

It is not a weakly prime, because it can be changed into another prime (122929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61460 + 61461.

It is an arithmetic number, because the mean of its divisors is an integer number (61461).

2¹²²⁹²¹ is an apocalyptic number.

It is an amenable number.

122921 is a deficient number, since it is larger than the sum of its proper divisors (1).

122921 is an equidigital number, since it uses as much as digits as its factorization.

122921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 122921 is about 350.6009127199. The cubic root of 122921 is about 49.7212488438.

It can be divided in two parts, 1 and 22921, that added together give a palindrome (22922).

The spelling of 122921 in words is "one hundred twenty-two thousand, nine hundred twenty-one".