121222122211 has 4 divisors (see below), whose sum is σ = 121266806872. Its totient is φ = 121177437552.

The previous prime is 121222122187. The next prime is 121222122221. The reversal of 121222122211 is 112221222121.

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 121222122211 - 2²⁵ = 121188567779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121222122221) 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, 22338261 + ... + 22343686.

It is an arithmetic number, because the mean of its divisors is an integer number (30316701718).

Almost surely, 2^121222122211 is an apocalyptic number.

121222122211 is a deficient number, since it is larger than the sum of its proper divisors (44684661).

121222122211 is an equidigital number, since it uses as much as digits as its factorization.

121222122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44684660.

The product of its digits is 128, while the sum is 19.

Adding to 121222122211 its reverse (112221222121), we get a palindrome (233443344332).

It can be divided in two parts, 1 and 21222122211, that added together give a palindrome (21222122212).

The spelling of 121222122211 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred eleven".