211122022221 has 36 divisors (see below), whose sum is σ = 338653219996. Its totient is φ = 126633576960.

The previous prime is 211122022187. The next prime is 211122022229. The reversal of 211122022221 is 122220221112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101305341225 + 109816680996 = 318285^2 + 331386^2 .

It is not a de Polignac number, because 211122022221 - 2⁶ = 211122022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211122022194 and 211122022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122022229) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 893686 + ... + 1104951.

Almost surely, 2^211122022221 is an apocalyptic number.

It is an amenable number.

211122022221 is a deficient number, since it is larger than the sum of its proper divisors (127531197775).

211122022221 is a wasteful number, since it uses less digits than its factorization.

211122022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998762 (or 1998748 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211122022221 its reverse (122220221112), we get a palindrome (333342243333).

The spelling of 211122022221 in words is "two hundred eleven billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".