2221121 has 6 divisors (see below), whose sum is σ = 2583810. Its totient is φ = 1903776.

The previous prime is 2221111. The next prime is 2221127. The reversal of 2221121 is 1211222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 261121 = 1400^2 + 511^2 .

It is not a de Polignac number, because 2221121 - 2¹⁴ = 2204737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22616 + ... + 22713.

It is an arithmetic number, because the mean of its divisors is an integer number (430635).

2^2221121 is an apocalyptic number.

It is an amenable number.

2221121 is a deficient number, since it is larger than the sum of its proper divisors (362689).

2221121 is an equidigital number, since it uses as much as digits as its factorization.

2221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45343 (or 45336 counting only the distinct ones).

The product of its digits is 16, while the sum is 11.

The square root of 2221121 is about 1490.3425780672. The cubic root of 2221121 is about 130.4740287811.

Adding to 2221121 its reverse (1211222), we get a palindrome (3432343).

The spelling of 2221121 in words is "two million, two hundred twenty-one thousand, one hundred twenty-one".