213400023 has 4 divisors (see below), whose sum is σ = 284533368. Its totient is φ = 142266680.

The previous prime is 213400007. The next prime is 213400027. The reversal of 213400023 is 320004312.

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

It is a cyclic number.

It is not a de Polignac number, because 213400023 - 2⁴ = 213400007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213399975 and 213400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213400027) 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, 35566668 + ... + 35566673.

It is an arithmetic number, because the mean of its divisors is an integer number (71133342).

Almost surely, 2^213400023 is an apocalyptic number.

213400023 is a deficient number, since it is larger than the sum of its proper divisors (71133345).

213400023 is an equidigital number, since it uses as much as digits as its factorization.

213400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71133344.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 213400023 is about 14608.2176530883. The cubic root of 213400023 is about 597.5828895934.

Adding to 213400023 its reverse (320004312), we get a palindrome (533404335).

The spelling of 213400023 in words is "two hundred thirteen million, four hundred thousand, twenty-three".