213405023 has 16 divisors (see below), whose sum is σ = 241151232. Its totient is φ = 187488000.

The previous prime is 213404999. The next prime is 213405043. The reversal of 213405023 is 320504312.

It is a happy number.

It is not a de Polignac number, because 213405023 - 2¹⁰ = 213403999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213404986 and 213405004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213405043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20243 + ... + 28923.

It is an arithmetic number, because the mean of its divisors is an integer number (15071952).

Almost surely, 2^213405023 is an apocalyptic number.

213405023 is a deficient number, since it is larger than the sum of its proper divisors (27746209).

213405023 is a wasteful number, since it uses less digits than its factorization.

213405023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8786.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 213405023 is about 14608.3887886378. The cubic root of 213405023 is about 597.5875567143.

Adding to 213405023 its reverse (320504312), we get a palindrome (533909335).

The spelling of 213405023 in words is "two hundred thirteen million, four hundred five thousand, twenty-three".