7211121 has 16 divisors (see below), whose sum is σ = 10281600. Its totient is φ = 4484480.

The previous prime is 7211119. The next prime is 7211129. The reversal of 7211121 is 1211127.

It is a cyclic number.

It is not a de Polignac number, because 7211121 - 2¹ = 7211119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7211121.

It is not an unprimeable number, because it can be changed into a prime (7211129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1555 + ... + 4103.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^7211121 is an apocalyptic number.

It is an amenable number.

7211121 is a deficient number, since it is larger than the sum of its proper divisors (3070479).

7211121 is a wasteful number, since it uses less digits than its factorization.

7211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616.

The product of its digits is 28, while the sum is 15.

The square root of 7211121 is about 2685.3530494145. The cubic root of 7211121 is about 193.1972443657.

Adding to 7211121 its reverse (1211127), we get a palindrome (8422248).

The spelling of 7211121 in words is "seven million, two hundred eleven thousand, one hundred twenty-one".