226863638653021 has 2 divisors, whose sum is σ = 226863638653022. Its totient is φ = 226863638653020.

The previous prime is 226863638653009. The next prime is 226863638653079. The reversal of 226863638653021 is 120356836368622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124516808864100 + 102346829788921 = 11158710^2 + 10116661^2 .

It is a cyclic number.

It is not a de Polignac number, because 226863638653021 - 2³⁹ = 226313882839133 is a prime.

It is a super-2 number, since 2×226863638653021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (226863638653081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113431819326510 + 113431819326511.

It is an arithmetic number, because the mean of its divisors is an integer number (113431819326511).

Almost surely, 2^{226863638653021} is an apocalyptic number.

It is an amenable number.

226863638653021 is a deficient number, since it is larger than the sum of its proper divisors (1).

226863638653021 is an equidigital number, since it uses as much as digits as its factorization.

226863638653021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 89579520, while the sum is 61.

The spelling of 226863638653021 in words is "two hundred twenty-six trillion, eight hundred sixty-three billion, six hundred thirty-eight million, six hundred fifty-three thousand, twenty-one".