212202211121 has 4 divisors (see below), whose sum is σ = 212205484644. Its totient is φ = 212198937600.

The previous prime is 212202211103. The next prime is 212202211159. The reversal of 212202211121 is 121112202212.

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 187540963600 + 24661247521 = 433060^2 + 157039^2 .

It is a cyclic number.

It is not a de Polignac number, because 212202211121 - 2⁶ = 212202211057 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 212202211121.

It is not an unprimeable number, because it can be changed into a prime (212202211021) 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, 1537520 + ... + 1669841.

It is an arithmetic number, because the mean of its divisors is an integer number (53051371161).

Almost surely, 2^212202211121 is an apocalyptic number.

It is an amenable number.

212202211121 is a deficient number, since it is larger than the sum of its proper divisors (3273523).

212202211121 is an equidigital number, since it uses as much as digits as its factorization.

212202211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3273522.

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

Adding to 212202211121 its reverse (121112202212), we get a palindrome (333314413333).

The spelling of 212202211121 in words is "two hundred twelve billion, two hundred two million, two hundred eleven thousand, one hundred twenty-one".