213000322121 has 4 divisors (see below), whose sum is σ = 225529752852. Its totient is φ = 200470891392.

The previous prime is 213000322091. The next prime is 213000322163. The reversal of 213000322121 is 121223000312.

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 184796814400 + 28203507721 = 429880^2 + 167939^2 .

It is not a de Polignac number, because 213000322121 - 2¹⁴ = 213000305737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12529430713 = 213000322121 / (2 + 1 + 3 + 0 + 0 + 0 + 3 + 2 + 2 + 1 + 2 + 1).

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 213000322121.

It is not an unprimeable number, because it can be changed into a prime (213000322021) 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, 6264715340 + ... + 6264715373.

It is an arithmetic number, because the mean of its divisors is an integer number (56382438213).

Almost surely, 2^213000322121 is an apocalyptic number.

It is an amenable number.

213000322121 is a deficient number, since it is larger than the sum of its proper divisors (12529430731).

213000322121 is a wasteful number, since it uses less digits than its factorization.

213000322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12529430730.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 213000322121 its reverse (121223000312), we get a palindrome (334223322433).

The spelling of 213000322121 in words is "two hundred thirteen billion, three hundred twenty-two thousand, one hundred twenty-one".