213707321 has 8 divisors (see below), whose sum is σ = 216566784. Its totient is φ = 210854800.

The previous prime is 213707317. The next prime is 213707327. The reversal of 213707321 is 123707312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213707321 - 2² = 213707317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213707327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94415 + ... + 96651.

It is an arithmetic number, because the mean of its divisors is an integer number (27070848).

Almost surely, 2^213707321 is an apocalyptic number.

It is an amenable number.

213707321 is a deficient number, since it is larger than the sum of its proper divisors (2859463).

213707321 is a wasteful number, since it uses less digits than its factorization.

213707321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 213707321 is about 14618.7318533449. The cubic root of 213707321 is about 597.8695936416.

Subtracting from 213707321 its reverse (123707312), we obtain a palindrome (90000009).

The spelling of 213707321 in words is "two hundred thirteen million, seven hundred seven thousand, three hundred twenty-one".