211122211021 has 8 divisors (see below), whose sum is σ = 213233268888. Its totient is φ = 209011560000.

The previous prime is 211122211009. The next prime is 211122211031. The reversal of 211122211021 is 120112221112.

It can be written as a sum of positive squares in 4 ways, for example, as 92589361225 + 118532849796 = 304285^2 + 344286^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211122211021 - 2²⁵ = 211088656589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211122210986 and 211122211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122211031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000731 + ... + 1193191.

It is an arithmetic number, because the mean of its divisors is an integer number (26654158611).

Almost surely, 2^211122211021 is an apocalyptic number.

It is an amenable number.

211122211021 is a deficient number, since it is larger than the sum of its proper divisors (2111057867).

211122211021 is a wasteful number, since it uses less digits than its factorization.

211122211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203423.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211122211021 its reverse (120112221112), we get a palindrome (331234432133).

The spelling of 211122211021 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".