211322212121 has 4 divisors (see below), whose sum is σ = 212543727972. Its totient is φ = 210100696272.

The previous prime is 211322212063. The next prime is 211322212147. The reversal of 211322212121 is 121212223112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74126052121 + 137196160000 = 272261^2 + 370400^2 .

It is a cyclic number.

It is not a de Polignac number, because 211322212121 - 2¹⁸ = 211321949977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211322212093 and 211322212102.

It is not an unprimeable number, because it can be changed into a prime (211322217121) 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, 610757666 + ... + 610758011.

It is an arithmetic number, because the mean of its divisors is an integer number (53135931993).

Almost surely, 2^211322212121 is an apocalyptic number.

It is an amenable number.

211322212121 is a deficient number, since it is larger than the sum of its proper divisors (1221515851).

211322212121 is a wasteful number, since it uses less digits than its factorization.

211322212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221515850.

The product of its digits is 192, while the sum is 20.

Adding to 211322212121 its reverse (121212223112), we get a palindrome (332534435233).

The spelling of 211322212121 in words is "two hundred eleven billion, three hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".