212200021221121 has 4 divisors (see below), whose sum is σ = 212206848575044. Its totient is φ = 212193193867200.

The previous prime is 212200021221119. The next prime is 212200021221151. The reversal of 212200021221121 is 121122120002212.

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 24217028366400 + 187982992854721 = 4921080^2 + 13710689^2 .

It is a cyclic number.

It is not a de Polignac number, because 212200021221121 - 2¹ = 212200021221119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212200021221151) 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, 3413630340 + ... + 3413692501.

It is an arithmetic number, because the mean of its divisors is an integer number (53051712143761).

Almost surely, 2^{212200021221121} is an apocalyptic number.

It is an amenable number.

212200021221121 is a deficient number, since it is larger than the sum of its proper divisors (6827353923).

212200021221121 is an equidigital number, since it uses as much as digits as its factorization.

212200021221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6827353922.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212200021221121 its reverse (121122120002212), we get a palindrome (333322141223333).

The spelling of 212200021221121 in words is "two hundred twelve trillion, two hundred billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".