213132320021 has 2 divisors, whose sum is σ = 213132320022. Its totient is φ = 213132320020.

The previous prime is 213132319973. The next prime is 213132320039. The reversal of 213132320021 is 120023231312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137058405796 + 76073914225 = 370214^2 + 275815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213132320021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213132319975 and 213132320002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213132320081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106566160010 + 106566160011.

It is an arithmetic number, because the mean of its divisors is an integer number (106566160011).

Almost surely, 2^213132320021 is an apocalyptic number.

It is an amenable number.

213132320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213132320021 is an equidigital number, since it uses as much as digits as its factorization.

213132320021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 213132320021 its reverse (120023231312), we get a palindrome (333155551333).

The spelling of 213132320021 in words is "two hundred thirteen billion, one hundred thirty-two million, three hundred twenty thousand, twenty-one".