212111301221 has 4 divisors (see below), whose sum is σ = 212601166092. Its totient is φ = 211621436352.

The previous prime is 212111301217. The next prime is 212111301253. The reversal of 212111301221 is 122103111212.

It is a happy number.

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 30838872100 + 181272429121 = 175610^2 + 425761^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111301221 - 2² = 212111301217 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 212111301221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111301821) 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, 244931786 + ... + 244932651.

It is an arithmetic number, because the mean of its divisors is an integer number (53150291523).

Almost surely, 2^212111301221 is an apocalyptic number.

It is an amenable number.

212111301221 is a deficient number, since it is larger than the sum of its proper divisors (489864871).

212111301221 is an equidigital number, since it uses as much as digits as its factorization.

212111301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489864870.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212111301221 its reverse (122103111212), we get a palindrome (334214412433).

The spelling of 212111301221 in words is "two hundred twelve billion, one hundred eleven million, three hundred one thousand, two hundred twenty-one".