213443403309 has 12 divisors (see below), whose sum is σ = 308311536156. Its totient is φ = 142293572352.

The previous prime is 213443403203. The next prime is 213443403319. The reversal of 213443403309 is 903304344312.

213443403309 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 4 + 340 + 3 + 309 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 140501277225 + 72942126084 = 374835^2 + 270078^2 .

It is not a de Polignac number, because 213443403309 - 2¹⁹ = 213442879021 is a prime.

It is a super-2 number, since 2×213443403309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213443403319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 772989 + ... + 1012125.

It is an arithmetic number, because the mean of its divisors is an integer number (25692628013).

Almost surely, 2^213443403309 is an apocalyptic number.

It is an amenable number.

213443403309 is a deficient number, since it is larger than the sum of its proper divisors (94868132847).

213443403309 is a wasteful number, since it uses less digits than its factorization.

213443403309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338316 (or 338313 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The spelling of 213443403309 in words is "two hundred thirteen billion, four hundred forty-three million, four hundred three thousand, three hundred nine".