7213231 has 8 divisors (see below), whose sum is σ = 7418880. Its totient is φ = 7009848.

The previous prime is 7213229. The next prime is 7213243. The reversal of 7213231 is 1323127.

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 7213231 - 2¹ = 7213229 is a prime.

It is a super-2 number, since 2×7213231² = 104061402918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7213199 and 7213208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7213201) 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, 7390 + ... + 8308.

It is an arithmetic number, because the mean of its divisors is an integer number (927360).

Almost surely, 2^7213231 is an apocalyptic number.

7213231 is a deficient number, since it is larger than the sum of its proper divisors (205649).

7213231 is a wasteful number, since it uses less digits than its factorization.

7213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133.

The product of its digits is 252, while the sum is 19.

The square root of 7213231 is about 2685.7458926712. The cubic root of 7213231 is about 193.2160859315.

Adding to 7213231 its reverse (1323127), we get a palindrome (8536358).

The spelling of 7213231 in words is "seven million, two hundred thirteen thousand, two hundred thirty-one".