2267721 has 6 divisors (see below), whose sum is σ = 3275610. Its totient is φ = 1511808.

The previous prime is 2267719. The next prime is 2267723. The reversal of 2267721 is 1277622.

It is an interprime number because it is at equal distance from previous prime (2267719) and next prime (2267723).

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 404496 = 1365^2 + 636^2 .

It is not a de Polignac number, because 2267721 - 2¹ = 2267719 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 2¹⁵ + 6⁴ + 7⁵ + 7⁶ + 2²¹ + 1 .

It is not an unprimeable number, because it can be changed into a prime (2267723) 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, 125976 + ... + 125993.

It is an arithmetic number, because the mean of its divisors is an integer number (545935).

2^2267721 is an apocalyptic number.

It is an amenable number.

2267721 is a deficient number, since it is larger than the sum of its proper divisors (1007889).

2267721 is a wasteful number, since it uses less digits than its factorization.

2267721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251975 (or 251972 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 2267721 is about 1505.8954146952. The cubic root of 2267721 is about 131.3801864720.

Subtracting from 2267721 its reverse (1277622), we obtain a palindrome (990099).

The spelling of 2267721 in words is "two million, two hundred sixty-seven thousand, seven hundred twenty-one".