212120212001 has 4 divisors (see below), whose sum is σ = 219434702100. Its totient is φ = 204805721904.

The previous prime is 212120211967. The next prime is 212120212033. The reversal of 212120212001 is 100212021212.

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 154999690000 + 57120522001 = 393700^2 + 238999^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120212001 - 2¹⁸ = 212119949857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212120211001) 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, 3657245006 + ... + 3657245063.

It is an arithmetic number, because the mean of its divisors is an integer number (54858675525).

Almost surely, 2^212120212001 is an apocalyptic number.

It is an amenable number.

212120212001 is a deficient number, since it is larger than the sum of its proper divisors (7314490099).

212120212001 is an equidigital number, since it uses as much as digits as its factorization.

212120212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314490098.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212120212001 its reverse (100212021212), we get a palindrome (312332233213).

The spelling of 212120212001 in words is "two hundred twelve billion, one hundred twenty million, two hundred twelve thousand, one".