226721 has 4 divisors (see below), whose sum is σ = 247344. Its totient is φ = 206100.

The previous prime is 226697. The next prime is 226741. The reversal of 226721 is 127622.

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 226721 - 2⁶ = 226657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 226693 and 226702.

It is not an unprimeable number, because it can be changed into a prime (226741) 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, 10295 + ... + 10316.

It is an arithmetic number, because the mean of its divisors is an integer number (61836).

2²²⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

226721 is a deficient number, since it is larger than the sum of its proper divisors (20623).

226721 is a wasteful number, since it uses less digits than its factorization.

226721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20622.

The product of its digits is 336, while the sum is 20.

The square root of 226721 is about 476.1522865639. The cubic root of 226721 is about 60.9766998712.

Subtracting from 226721 its reverse (127622), we obtain a palindrome (99099).

The spelling of 226721 in words is "two hundred twenty-six thousand, seven hundred twenty-one".