212220121211 has 4 divisors (see below), whose sum is σ = 242537281392. Its totient is φ = 181902961032.

The previous prime is 212220121199. The next prime is 212220121229. The reversal of 212220121211 is 112121022212.

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 212220121211 - 2²⁶ = 212153012347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212220121211.

It is not an unprimeable number, because it can be changed into a prime (212220121291) 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, 15158580080 + ... + 15158580093.

It is an arithmetic number, because the mean of its divisors is an integer number (60634320348).

Almost surely, 2^212220121211 is an apocalyptic number.

212220121211 is a deficient number, since it is larger than the sum of its proper divisors (30317160181).

212220121211 is an equidigital number, since it uses as much as digits as its factorization.

212220121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30317160180.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212220121211 its reverse (112121022212), we get a palindrome (324341143423).

It can be divided in two parts, 2122201 and 21211, that added together give a palindrome (2143412).

The spelling of 212220121211 in words is "two hundred twelve billion, two hundred twenty million, one hundred twenty-one thousand, two hundred eleven".