213242420081 has 2 divisors, whose sum is σ = 213242420082. Its totient is φ = 213242420080.

The previous prime is 213242420077. The next prime is 213242420093. The reversal of 213242420081 is 180024242312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174606979600 + 38635440481 = 417860^2 + 196559^2 .

It is a cyclic number.

It is not a de Polignac number, because 213242420081 - 2² = 213242420077 is a prime.

It is a super-2 number, since 2×213242420081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213242410081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106621210040 + 106621210041.

It is an arithmetic number, because the mean of its divisors is an integer number (106621210041).

Almost surely, 2^213242420081 is an apocalyptic number.

It is an amenable number.

213242420081 is a deficient number, since it is larger than the sum of its proper divisors (1).

213242420081 is an equidigital number, since it uses as much as digits as its factorization.

213242420081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 213242420081 its reverse (180024242312), we get a palindrome (393266662393).

The spelling of 213242420081 in words is "two hundred thirteen billion, two hundred forty-two million, four hundred twenty thousand, eighty-one".