121212111222211 has 16 divisors (see below), whose sum is σ = 127680191200800. Its totient is φ = 114752902998528.

The previous prime is 121212111222193. The next prime is 121212111222229. The reversal of 121212111222211 is 112222111212121.

It is an interprime number because it is at equal distance from previous prime (121212111222193) and next prime (121212111222229).

It is a cyclic number.

It is not a de Polignac number, because 121212111222211 - 2¹⁵ = 121212111189443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121212111222011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198250485 + ... + 198860953.

It is an arithmetic number, because the mean of its divisors is an integer number (7980011950050).

Almost surely, 2^{121212111222211} is an apocalyptic number.

121212111222211 is a deficient number, since it is larger than the sum of its proper divisors (6468079978589).

121212111222211 is a wasteful number, since it uses less digits than its factorization.

121212111222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617718.

The product of its digits is 128, while the sum is 22.

Adding to 121212111222211 its reverse (112222111212121), we get a palindrome (233434222434332).

The spelling of 121212111222211 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, two hundred eleven".