894336220621 has 2 divisors, whose sum is σ = 894336220622. Its totient is φ = 894336220620.

The previous prime is 894336220601. The next prime is 894336220627. The reversal of 894336220621 is 126022633498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826626456100 + 67709764521 = 909190^2 + 260211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-894336220621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (894336220627) 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, 447168110310 + 447168110311.

It is an arithmetic number, because the mean of its divisors is an integer number (447168110311).

Almost surely, 2^894336220621 is an apocalyptic number.

It is an amenable number.

894336220621 is a deficient number, since it is larger than the sum of its proper divisors (1).

894336220621 is an equidigital number, since it uses as much as digits as its factorization.

894336220621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 894336220621 in words is "eight hundred ninety-four billion, three hundred thirty-six million, two hundred twenty thousand, six hundred twenty-one".