226939721 has 2 divisors, whose sum is σ = 226939722. Its totient is φ = 226939720.

The previous prime is 226939717. The next prime is 226939723. The reversal of 226939721 is 127939622.

226939721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226924096 + 15625 = 15064^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 226939721 - 2² = 226939717 is a prime.

It is a Sophie Germain prime.

Together with 226939723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (226939723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113469860 + 113469861.

It is an arithmetic number, because the mean of its divisors is an integer number (113469861).

Almost surely, 2^226939721 is an apocalyptic number.

It is an amenable number.

226939721 is a deficient number, since it is larger than the sum of its proper divisors (1).

226939721 is an equidigital number, since it uses as much as digits as its factorization.

226939721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 226939721 is about 15064.5186116251. The cubic root of 226939721 is about 609.9630193473.

Subtracting from 226939721 its reverse (127939622), we obtain a palindrome (99000099).

The spelling of 226939721 in words is "two hundred twenty-six million, nine hundred thirty-nine thousand, seven hundred twenty-one".