7161221 has 4 divisors (see below), whose sum is σ = 7177152. Its totient is φ = 7145292.

The previous prime is 7161197. The next prime is 7161223. The reversal of 7161221 is 1221617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7161221 - 2¹⁸ = 6899077 is a prime.

It is a pancake number, because a pancake can be divided into 7161221 parts by 3784 straight cuts.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7161193 and 7161202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7161223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7271 + ... + 8196.

It is an arithmetic number, because the mean of its divisors is an integer number (1794288).

Almost surely, 2^7161221 is an apocalyptic number.

It is an amenable number.

7161221 is a deficient number, since it is larger than the sum of its proper divisors (15931).

7161221 is a wasteful number, since it uses less digits than its factorization.

7161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15930.

The product of its digits is 168, while the sum is 20.

The square root of 7161221 is about 2676.0457768880. The cubic root of 7161221 is about 192.7505793941.

Adding to 7161221 its reverse (1221617), we get a palindrome (8382838).

The spelling of 7161221 in words is "seven million, one hundred sixty-one thousand, two hundred twenty-one".