213023431405 has 4 divisors (see below), whose sum is σ = 255628117692. Its totient is φ = 170418745120.

The previous prime is 213023431403. The next prime is 213023431441. The reversal of 213023431405 is 504134320312.

It is a happy number.

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 60133829284 + 152889602121 = 245222^2 + 391011^2 .

It is not a de Polignac number, because 213023431405 - 2¹ = 213023431403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213023431403) 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, 21302343136 + ... + 21302343145.

It is an arithmetic number, because the mean of its divisors is an integer number (63907029423).

Almost surely, 2^213023431405 is an apocalyptic number.

It is an amenable number.

213023431405 is a deficient number, since it is larger than the sum of its proper divisors (42604686287).

213023431405 is an equidigital number, since it uses as much as digits as its factorization.

213023431405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42604686286.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 213023431405 its reverse (504134320312), we get a palindrome (717157751717).

The spelling of 213023431405 in words is "two hundred thirteen billion, twenty-three million, four hundred thirty-one thousand, four hundred five".