213123329 has 4 divisors (see below), whose sum is σ = 213167040. Its totient is φ = 213079620.

The previous prime is 213123319. The next prime is 213123331. The reversal of 213123329 is 923321312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213123329 - 2¹² = 213119233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213123298 and 213123307.

It is not an unprimeable number, because it can be changed into a prime (213123319) 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, 13469 + ... + 24650.

It is an arithmetic number, because the mean of its divisors is an integer number (53291760).

Almost surely, 2^213123329 is an apocalyptic number.

It is an amenable number.

213123329 is a deficient number, since it is larger than the sum of its proper divisors (43711).

213123329 is an equidigital number, since it uses as much as digits as its factorization.

213123329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43710.

The product of its digits is 1944, while the sum is 26.

The square root of 213123329 is about 14598.7440898181. The cubic root of 213123329 is about 597.3245030004.

The spelling of 213123329 in words is "two hundred thirteen million, one hundred twenty-three thousand, three hundred twenty-nine".