213213031321 has 2 divisors, whose sum is σ = 213213031322. Its totient is φ = 213213031320.

The previous prime is 213213031307. The next prime is 213213031379. The reversal of 213213031321 is 123130312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199898410000 + 13314621321 = 447100^2 + 115389^2 .

It is a cyclic number.

It is not a de Polignac number, because 213213031321 - 2⁹ = 213213030809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213213031292 and 213213031301.

It is not a weakly prime, because it can be changed into another prime (213213031301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106606515660 + 106606515661.

It is an arithmetic number, because the mean of its divisors is an integer number (106606515661).

Almost surely, 2^213213031321 is an apocalyptic number.

It is an amenable number.

213213031321 is a deficient number, since it is larger than the sum of its proper divisors (1).

213213031321 is an equidigital number, since it uses as much as digits as its factorization.

213213031321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 213213031321 its reverse (123130312312), we get a palindrome (336343343633).

The spelling of 213213031321 in words is "two hundred thirteen billion, two hundred thirteen million, thirty-one thousand, three hundred twenty-one".