226621 has 2 divisors, whose sum is σ = 226622. Its totient is φ = 226620.

The previous prime is 226609. The next prime is 226631. The reversal of 226621 is 126622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 55225 = 414^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 226621 - 2¹⁷ = 95549 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (226601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113310 + 113311.

It is an arithmetic number, because the mean of its divisors is an integer number (113311).

2²²⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

226621 is a deficient number, since it is larger than the sum of its proper divisors (1).

226621 is an equidigital number, since it uses as much as digits as its factorization.

226621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 226621 is about 476.0472665608. The cubic root of 226621 is about 60.9677335401.

Subtracting from 226621 its reverse (126622), we obtain a palindrome (99999).

It can be divided in two parts, 2266 and 21, that multiplied together give a triangular number (47586 = T₃₀₈).

The spelling of 226621 in words is "two hundred twenty-six thousand, six hundred twenty-one".