213240211993 has 2 divisors, whose sum is σ = 213240211994. Its totient is φ = 213240211992.

The previous prime is 213240211981. The next prime is 213240212033. The reversal of 213240211993 is 399112042312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168848671744 + 44391540249 = 410912^2 + 210693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213240211993 is a prime.

It is not a weakly prime, because it can be changed into another prime (213240211963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106620105996 + 106620105997.

It is an arithmetic number, because the mean of its divisors is an integer number (106620105997).

Almost surely, 2^213240211993 is an apocalyptic number.

It is an amenable number.

213240211993 is a deficient number, since it is larger than the sum of its proper divisors (1).

213240211993 is an equidigital number, since it uses as much as digits as its factorization.

213240211993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 213240211993 in words is "two hundred thirteen billion, two hundred forty million, two hundred eleven thousand, nine hundred ninety-three".