2221161 has 4 divisors (see below), whose sum is σ = 2961552. Its totient is φ = 1480772.

The previous prime is 2221159. The next prime is 2221183. The reversal of 2221161 is 1611222.

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 2221161 - 2¹ = 2221159 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221161.

It is not an unprimeable number, because it can be changed into a prime (2221111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370191 + ... + 370196.

It is an arithmetic number, because the mean of its divisors is an integer number (740388).

2^2221161 is an apocalyptic number.

It is an amenable number.

2221161 is a deficient number, since it is larger than the sum of its proper divisors (740391).

2221161 is an equidigital number, since it uses as much as digits as its factorization.

2221161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740390.

The product of its digits is 48, while the sum is 15.

The square root of 2221161 is about 1490.3559977401. The cubic root of 2221161 is about 130.4748120087.

Adding to 2221161 its reverse (1611222), we get a palindrome (3832383).

The spelling of 2221161 in words is "two million, two hundred twenty-one thousand, one hundred sixty-one".