213110320021 has 2 divisors, whose sum is σ = 213110320022. Its totient is φ = 213110320020.

The previous prime is 213110319911. The next prime is 213110320079. The reversal of 213110320021 is 120023011312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189420800625 + 23689519396 = 435225^2 + 153914^2 .

It is a cyclic number.

It is not a de Polignac number, because 213110320021 - 2³³ = 204520385429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213110319977 and 213110320004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213110320091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106555160010 + 106555160011.

It is an arithmetic number, because the mean of its divisors is an integer number (106555160011).

Almost surely, 2^213110320021 is an apocalyptic number.

It is an amenable number.

213110320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213110320021 is an equidigital number, since it uses as much as digits as its factorization.

213110320021 is an evil number, because the sum of its binary digits is even.

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

Adding to 213110320021 its reverse (120023011312), we get a palindrome (333133331333).

The spelling of 213110320021 in words is "two hundred thirteen billion, one hundred ten million, three hundred twenty thousand, twenty-one".