7135221 has 8 divisors (see below), whose sum is σ = 9927360. Its totient is φ = 4549952.

The previous prime is 7135217. The next prime is 7135229. The reversal of 7135221 is 1225317.

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

It is not a de Polignac number, because 7135221 - 2² = 7135217 is a prime.

It is a super-2 number, since 2×7135221² = 101822757437682, which contains 22 as substring.

7135221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7135229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51636 + ... + 51773.

It is an arithmetic number, because the mean of its divisors is an integer number (1240920).

Almost surely, 2^7135221 is an apocalyptic number.

It is an amenable number.

7135221 is a deficient number, since it is larger than the sum of its proper divisors (2792139).

7135221 is a wasteful number, since it uses less digits than its factorization.

7135221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103435.

The product of its digits is 420, while the sum is 21.

The square root of 7135221 is about 2671.1834455911. The cubic root of 7135221 is about 192.5170255364.

The spelling of 7135221 in words is "seven million, one hundred thirty-five thousand, two hundred twenty-one".