121212100211 has 4 divisors (see below), whose sum is σ = 121229038800. Its totient is φ = 121195161624.

The previous prime is 121212100201. The next prime is 121212100259. The reversal of 121212100211 is 112001212121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212100211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212100201) 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, 8458556 + ... + 8472873.

It is an arithmetic number, because the mean of its divisors is an integer number (30307259700).

Almost surely, 2^121212100211 is an apocalyptic number.

121212100211 is a deficient number, since it is larger than the sum of its proper divisors (16938589).

121212100211 is an equidigital number, since it uses as much as digits as its factorization.

121212100211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16938588.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121212100211 its reverse (112001212121), we get a palindrome (233213312332).

The spelling of 121212100211 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred thousand, two hundred eleven".