213122643 has 4 divisors (see below), whose sum is σ = 284163528. Its totient is φ = 142081760.

The previous prime is 213122629. The next prime is 213122671. The reversal of 213122643 is 346221312.

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 213122643 - 2¹² = 213118547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213122603) 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, 35520438 + ... + 35520443.

It is an arithmetic number, because the mean of its divisors is an integer number (71040882).

Almost surely, 2^213122643 is an apocalyptic number.

213122643 is a deficient number, since it is larger than the sum of its proper divisors (71040885).

213122643 is an equidigital number, since it uses as much as digits as its factorization.

213122643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71040884.

The product of its digits is 1728, while the sum is 24.

The square root of 213122643 is about 14598.7205946275. The cubic root of 213122643 is about 597.3238621116.

Adding to 213122643 its reverse (346221312), we get a palindrome (559343955).

The spelling of 213122643 in words is "two hundred thirteen million, one hundred twenty-two thousand, six hundred forty-three".