6721231 has 8 divisors (see below), whose sum is σ = 7718400. Its totient is φ = 5788440.

The previous prime is 6721219. The next prime is 6721237. The reversal of 6721231 is 1321276.

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 6721231 - 2⁵ = 6721199 is a prime.

It is a super-2 number, since 2×6721231² = 90349892310722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721237) 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, 15871 + ... + 16288.

It is an arithmetic number, because the mean of its divisors is an integer number (964800).

Almost surely, 2^6721231 is an apocalyptic number.

6721231 is a deficient number, since it is larger than the sum of its proper divisors (997169).

6721231 is a wasteful number, since it uses less digits than its factorization.

6721231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32189.

The product of its digits is 504, while the sum is 22.

The square root of 6721231 is about 2592.5337027703. The cubic root of 6721231 is about 188.7192812895.

It can be divided in two parts, 6721 and 231, that multiplied together give a palindrome (1552551).

The spelling of 6721231 in words is "six million, seven hundred twenty-one thousand, two hundred thirty-one".