213671723405 has 32 divisors (see below), whose sum is σ = 295428612096. Its totient is φ = 145321876224.

The previous prime is 213671723399. The next prime is 213671723431. The reversal of 213671723405 is 504327176312.

It is a happy number.

It is not a de Polignac number, because 213671723405 - 2⁸ = 213671723149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27541787 + ... + 27549543.

It is an arithmetic number, because the mean of its divisors is an integer number (9232144128).

Almost surely, 2^213671723405 is an apocalyptic number.

It is an amenable number.

213671723405 is a deficient number, since it is larger than the sum of its proper divisors (81756888691).

213671723405 is a wasteful number, since it uses less digits than its factorization.

213671723405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14093.

The product of its (nonzero) digits is 211680, while the sum is 41.

Adding to 213671723405 its reverse (504327176312), we get a palindrome (717998899717).

The spelling of 213671723405 in words is "two hundred thirteen billion, six hundred seventy-one million, seven hundred twenty-three thousand, four hundred five".