212011222121 has 4 divisors (see below), whose sum is σ = 214997295744. Its totient is φ = 209025148500.

The previous prime is 212011222117. The next prime is 212011222169. The reversal of 212011222121 is 121222110212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212011222121 - 2² = 212011222117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212011222121.

It is not an unprimeable number, because it can be changed into a prime (212011222921) 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, 1493036705 + ... + 1493036846.

It is an arithmetic number, because the mean of its divisors is an integer number (53749323936).

Almost surely, 2^212011222121 is an apocalyptic number.

It is an amenable number.

212011222121 is a deficient number, since it is larger than the sum of its proper divisors (2986073623).

212011222121 is an equidigital number, since it uses as much as digits as its factorization.

212011222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986073622.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212011222121 its reverse (121222110212), we get a palindrome (333233332333).

The spelling of 212011222121 in words is "two hundred twelve billion, eleven million, two hundred twenty-two thousand, one hundred twenty-one".