213468307993 has 2 divisors, whose sum is σ = 213468307994. Its totient is φ = 213468307992.

The previous prime is 213468307961. The next prime is 213468308003. The reversal of 213468307993 is 399703864312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194504814729 + 18963493264 = 441027^2 + 137708^2 .

It is a cyclic number.

It is not a de Polignac number, because 213468307993 - 2⁵ = 213468307961 is a prime.

It is not a weakly prime, because it can be changed into another prime (213468307933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106734153996 + 106734153997.

It is an arithmetic number, because the mean of its divisors is an integer number (106734153997).

Almost surely, 2^213468307993 is an apocalyptic number.

It is an amenable number.

213468307993 is a deficient number, since it is larger than the sum of its proper divisors (1).

213468307993 is an equidigital number, since it uses as much as digits as its factorization.

213468307993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 213468307993 in words is "two hundred thirteen billion, four hundred sixty-eight million, three hundred seven thousand, nine hundred ninety-three".