211122122211221 has 32 divisors (see below), whose sum is σ = 228857498610048. Its totient is φ = 193604581785600.

The previous prime is 211122122211181. The next prime is 211122122211283. The reversal of 211122122211221 is 122112221221112.

It is a cyclic number.

It is not a de Polignac number, because 211122122211221 - 2⁴² = 206724075700117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122122211521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10078861070 + ... + 10078882016.

It is an arithmetic number, because the mean of its divisors is an integer number (7151796831564).

Almost surely, 2^{211122122211221} is an apocalyptic number.

It is an amenable number.

211122122211221 is a deficient number, since it is larger than the sum of its proper divisors (17735376398827).

211122122211221 is a wasteful number, since it uses less digits than its factorization.

211122122211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29141.

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

Adding to 211122122211221 its reverse (122112221221112), we get a palindrome (333234343432333).

The spelling of 211122122211221 in words is "two hundred eleven trillion, one hundred twenty-two billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".