122121 has 8 divisors (see below), whose sum is σ = 180960. Its totient is φ = 81396.

The previous prime is 122117. The next prime is 122131. The reversal of 122121 is 121221.

It is not a de Polignac number, because 122121 - 2² = 122117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2235 + ... + 2288.

It is an arithmetic number, because the mean of its divisors is an integer number (22620).

2¹²²¹²¹ is an apocalyptic number.

It is an amenable number.

122121 is a deficient number, since it is larger than the sum of its proper divisors (58839).

122121 is an equidigital number, since it uses as much as digits as its factorization.

122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532 (or 4526 counting only the distinct ones).

The product of its digits is 8, while the sum is 9.

The square root of 122121 is about 349.4581520011. The cubic root of 122121 is about 49.6131479626.

Adding to 122121 its reverse (121221), we get a palindrome (243342).

Subtracting from 122121 its reverse (121221), we obtain a square (900 = 30²).

It can be divided in two parts, 122 and 121, that added together give a 5-th power (243 = 3⁵).

The spelling of 122121 in words is "one hundred twenty-two thousand, one hundred twenty-one", and thus it is an iban number.