213994489873 has 4 divisors (see below), whose sum is σ = 226582401060. Its totient is φ = 201406578688.

The previous prime is 213994489861. The next prime is 213994489897. The reversal of 213994489873 is 378984499312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64918963264 + 149075526609 = 254792^2 + 386103^2 .

It is a cyclic number.

It is not a de Polignac number, because 213994489873 - 2⁹ = 213994489361 is a prime.

It is a super-2 number, since 2×213994489873² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213994489799 and 213994489808.

It is not an unprimeable number, because it can be changed into a prime (213994489823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6293955568 + ... + 6293955601.

It is an arithmetic number, because the mean of its divisors is an integer number (56645600265).

Almost surely, 2^213994489873 is an apocalyptic number.

It is an amenable number.

213994489873 is a deficient number, since it is larger than the sum of its proper divisors (12587911187).

213994489873 is a wasteful number, since it uses less digits than its factorization.

213994489873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12587911186.

The product of its digits is 94058496, while the sum is 67.

The spelling of 213994489873 in words is "two hundred thirteen billion, nine hundred ninety-four million, four hundred eighty-nine thousand, eight hundred seventy-three".