213151321 has 8 divisors (see below), whose sum is σ = 229059360. Its totient is φ = 197617728.

The previous prime is 213151303. The next prime is 213151331. The reversal of 213151321 is 123151312.

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 213151321 - 2¹⁹ = 212627033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213151331) 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, 92431 + ... + 94708.

It is an arithmetic number, because the mean of its divisors is an integer number (28632420).

Almost surely, 2^213151321 is an apocalyptic number.

It is an amenable number.

213151321 is a deficient number, since it is larger than the sum of its proper divisors (15908039).

213151321 is a wasteful number, since it uses less digits than its factorization.

213151321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187223.

The product of its digits is 180, while the sum is 19.

The square root of 213151321 is about 14599.7027709471. The cubic root of 213151321 is about 597.3506530791.

Subtracting from 213151321 its reverse (123151312), we obtain a palindrome (90000009).

The spelling of 213151321 in words is "two hundred thirteen million, one hundred fifty-one thousand, three hundred twenty-one".