211212122122211 has 4 divisors (see below), whose sum is σ = 241385282425392. Its totient is φ = 181038961819032.

The previous prime is 211212122122153. The next prime is 211212122122213. The reversal of 211212122122211 is 112221221212112.

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 211212122122211 - 2²² = 211212117927907 is a prime.

It is a super-2 number, since 2×211212122122211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211212122122213) 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, 15086580151580 + ... + 15086580151593.

It is an arithmetic number, because the mean of its divisors is an integer number (60346320606348).

Almost surely, 2^{211212122122211} is an apocalyptic number.

211212122122211 is a deficient number, since it is larger than the sum of its proper divisors (30173160303181).

211212122122211 is an equidigital number, since it uses as much as digits as its factorization.

211212122122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30173160303180.

The product of its digits is 256, while the sum is 23.

Adding to 211212122122211 its reverse (112221221212112), we get a palindrome (323433343334323).

The spelling of 211212122122211 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred eleven".