213311023 has 4 divisors (see below), whose sum is σ = 213739000. Its totient is φ = 212883048.

The previous prime is 213311011. The next prime is 213311029. The reversal of 213311023 is 320113312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213311023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213310988 and 213311006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213311029) 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, 213240 + ... + 214237.

It is an arithmetic number, because the mean of its divisors is an integer number (53434750).

Almost surely, 2^213311023 is an apocalyptic number.

213311023 is a deficient number, since it is larger than the sum of its proper divisors (427977).

213311023 is an equidigital number, since it uses as much as digits as its factorization.

213311023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427976.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213311023 is about 14605.1711047834. The cubic root of 213311023 is about 597.4998026411.

Adding to 213311023 its reverse (320113312), we get a palindrome (533424335).

The spelling of 213311023 in words is "two hundred thirteen million, three hundred eleven thousand, twenty-three".