122121211211 has 4 divisors (see below), whose sum is σ = 128548643400. Its totient is φ = 115693779024.

The previous prime is 122121211187. The next prime is 122121211213. The reversal of 122121211211 is 112112121221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122121211211 - 2³⁴ = 104941342027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122121211211.

It is not an unprimeable number, because it can be changed into a prime (122121211213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3213716066 + ... + 3213716103.

It is an arithmetic number, because the mean of its divisors is an integer number (32137160850).

Almost surely, 2^122121211211 is an apocalyptic number.

122121211211 is a deficient number, since it is larger than the sum of its proper divisors (6427432189).

122121211211 is an equidigital number, since it uses as much as digits as its factorization.

122121211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6427432188.

The product of its digits is 32, while the sum is 17.

Adding to 122121211211 its reverse (112112121221), we get a palindrome (234233332432).

The spelling of 122121211211 in words is "one hundred twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred eleven".