121212212211 has 8 divisors (see below), whose sum is σ = 179573647760. Its totient is φ = 80808141456.

The previous prime is 121212212197. The next prime is 121212212257. The reversal of 121212212211 is 112212212121.

It is not a de Polignac number, because 121212212211 - 2⁷ = 121212212083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212202211) 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, 2244670570 + ... + 2244670623.

It is an arithmetic number, because the mean of its divisors is an integer number (22446705970).

Almost surely, 2^121212212211 is an apocalyptic number.

121212212211 is a deficient number, since it is larger than the sum of its proper divisors (58361435549).

121212212211 is an equidigital number, since it uses as much as digits as its factorization.

121212212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489341202 (or 4489341196 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121212212211 its reverse (112212212121), we get a palindrome (233424424332).

The spelling of 121212212211 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, two hundred eleven".