213001320121 has 4 divisors (see below), whose sum is σ = 213004171044. Its totient is φ = 212998469200.

The previous prime is 213001320073. The next prime is 213001320151. The reversal of 213001320121 is 121023100312.

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 173226602025 + 39774718096 = 416205^2 + 199436^2 .

It is a cyclic number.

It is not a de Polignac number, because 213001320121 - 2³⁵ = 178641581753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213001320095 and 213001320104.

It is not an unprimeable number, because it can be changed into a prime (213001320151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1310290 + ... + 1463851.

It is an arithmetic number, because the mean of its divisors is an integer number (53251042761).

Almost surely, 2^213001320121 is an apocalyptic number.

It is an amenable number.

213001320121 is a deficient number, since it is larger than the sum of its proper divisors (2850923).

213001320121 is an equidigital number, since it uses as much as digits as its factorization.

213001320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850922.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 213001320121 its reverse (121023100312), we get a palindrome (334024420433).

The spelling of 213001320121 in words is "two hundred thirteen billion, one million, three hundred twenty thousand, one hundred twenty-one".