226157021 has 2 divisors, whose sum is σ = 226157022. Its totient is φ = 226157020.

The previous prime is 226156991. The next prime is 226157047. The reversal of 226157021 is 120751622.

It is an a-pointer prime, because the next prime (226157047) can be obtained adding 226157021 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163968025 + 62188996 = 12805^2 + 7886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-226157021 is a prime.

It is a super-2 number, since 2×226157021² = 102293996295188882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (226151021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113078510 + 113078511.

It is an arithmetic number, because the mean of its divisors is an integer number (113078511).

Almost surely, 2^226157021 is an apocalyptic number.

It is an amenable number.

226157021 is a deficient number, since it is larger than the sum of its proper divisors (1).

226157021 is an equidigital number, since it uses as much as digits as its factorization.

226157021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 226157021 is about 15038.5179123476. The cubic root of 226157021 is about 609.2609709968.

The spelling of 226157021 in words is "two hundred twenty-six million, one hundred fifty-seven thousand, twenty-one".