212220111121 has 4 divisors (see below), whose sum is σ = 213571831732. Its totient is φ = 210868390512.

The previous prime is 212220111113. The next prime is 212220111151. The reversal of 212220111121 is 121111022212.

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 90038404096 + 122181707025 = 300064^2 + 349545^2 .

It is a cyclic number.

It is not a de Polignac number, because 212220111121 - 2³ = 212220111113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220111095 and 212220111104.

It is not an unprimeable number, because it can be changed into a prime (212220111101) 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, 675860070 + ... + 675860383.

It is an arithmetic number, because the mean of its divisors is an integer number (53392957933).

Almost surely, 2^212220111121 is an apocalyptic number.

It is an amenable number.

212220111121 is a deficient number, since it is larger than the sum of its proper divisors (1351720611).

212220111121 is a wasteful number, since it uses less digits than its factorization.

212220111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351720610.

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

Adding to 212220111121 its reverse (121111022212), we get a palindrome (333331133333).

The spelling of 212220111121 in words is "two hundred twelve billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-one".