213112031321 has 6 divisors (see below), whose sum is σ = 247905832410. Its totient is φ = 182667455376.

The previous prime is 213112031311. The next prime is 213112031351. The reversal of 213112031321 is 123130211312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 167461008400 + 45651022921 = 409220^2 + 213661^2 .

It is not a de Polignac number, because 213112031321 - 2¹⁰ = 213112030297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213112031293 and 213112031302.

It is not an unprimeable number, because it can be changed into a prime (213112031311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2174612516 + ... + 2174612613.

It is an arithmetic number, because the mean of its divisors is an integer number (41317638735).

Almost surely, 2^213112031321 is an apocalyptic number.

It is an amenable number.

213112031321 is a deficient number, since it is larger than the sum of its proper divisors (34793801089).

213112031321 is an equidigital number, since it uses as much as digits as its factorization.

213112031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349225143 (or 4349225136 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213112031321 its reverse (123130211312), we get a palindrome (336242242633).

The spelling of 213112031321 in words is "two hundred thirteen billion, one hundred twelve million, thirty-one thousand, three hundred twenty-one".