921228422393 has 2 divisors, whose sum is σ = 921228422394. Its totient is φ = 921228422392.

The previous prime is 921228422347. The next prime is 921228422423. The reversal of 921228422393 is 393224822129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485262705664 + 435965716729 = 696608^2 + 660277^2 .

It is a cyclic number.

It is not a de Polignac number, because 921228422393 - 2⁸ = 921228422137 is a prime.

It is not a weakly prime, because it can be changed into another prime (921228422293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460614211196 + 460614211197.

It is an arithmetic number, because the mean of its divisors is an integer number (460614211197).

Almost surely, 2^921228422393 is an apocalyptic number.

It is an amenable number.

921228422393 is a deficient number, since it is larger than the sum of its proper divisors (1).

921228422393 is an equidigital number, since it uses as much as digits as its factorization.

921228422393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 47.

The spelling of 921228422393 in words is "nine hundred twenty-one billion, two hundred twenty-eight million, four hundred twenty-two thousand, three hundred ninety-three".