2221731 has 12 divisors (see below), whose sum is σ = 3349008. Its totient is φ = 1416624.

The previous prime is 2221721. The next prime is 2221733. The reversal of 2221731 is 1371222.

2221731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2221731 - 2⁵ = 2221699 is a prime.

It is a super-2 number, since 2×2221731² = 9872177272722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2221733) 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 11 ways as a sum of consecutive naturals, for example, 5160 + ... + 5573.

It is an arithmetic number, because the mean of its divisors is an integer number (279084).

2^2221731 is an apocalyptic number.

2221731 is a deficient number, since it is larger than the sum of its proper divisors (1127277).

2221731 is a wasteful number, since it uses less digits than its factorization.

2221731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762 (or 10759 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 2221731 is about 1490.5472149516. The cubic root of 2221731 is about 130.4859719805.

Adding to 2221731 its reverse (1371222), we get a palindrome (3592953).

It can be divided in two parts, 222 and 1731, that added together give a triangular number (1953 = T₆₂).

The spelling of 2221731 in words is "two million, two hundred twenty-one thousand, seven hundred thirty-one".