212200121 has 4 divisors (see below), whose sum is σ = 242514432. Its totient is φ = 181885812.

The previous prime is 212200111. The next prime is 212200127. The reversal of 212200121 is 121002212.

It is a happy number.

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 212200121 - 2¹⁸ = 211937977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212200127) 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, 15157145 + ... + 15157158.

It is an arithmetic number, because the mean of its divisors is an integer number (60628608).

Almost surely, 2^212200121 is an apocalyptic number.

It is an amenable number.

212200121 is a deficient number, since it is larger than the sum of its proper divisors (30314311).

212200121 is an equidigital number, since it uses as much as digits as its factorization.

212200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30314310.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 212200121 is about 14567.0903409020. The cubic root of 212200121 is about 596.4607575056.

Adding to 212200121 its reverse (121002212), we get a palindrome (333202333).

The spelling of 212200121 in words is "two hundred twelve million, two hundred thousand, one hundred twenty-one".