213444623 has 12 divisors (see below), whose sum is σ = 255008208. Its totient is φ = 174995040.

The previous prime is 213444607. The next prime is 213444629. The reversal of 213444623 is 326444312.

213444623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213444623 - 2⁴ = 213444607 is a prime.

It is a super-2 number, since 2×213444623² = 91117214175224258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213444629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25118 + ... + 32523.

It is an arithmetic number, because the mean of its divisors is an integer number (21250684).

Almost surely, 2^213444623 is an apocalyptic number.

213444623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

213444623 is a deficient number, since it is larger than the sum of its proper divisors (41563585).

213444623 is an equidigital number, since it uses as much as digits as its factorization.

213444623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57694 (or 57671 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

The square root of 213444623 is about 14609.7441113799. The cubic root of 213444623 is about 597.6245177369.

Adding to 213444623 its reverse (326444312), we get a palindrome (539888935).

The spelling of 213444623 in words is "two hundred thirteen million, four hundred forty-four thousand, six hundred twenty-three".