42774318221 has 2 divisors, whose sum is σ = 42774318222. Its totient is φ = 42774318220.

The previous prime is 42774318217. The next prime is 42774318247. The reversal of 42774318221 is 12281347724.

42774318221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37000446025 + 5773872196 = 192355^2 + 75986^2 .

It is a cyclic number.

It is not a de Polignac number, because 42774318221 - 2² = 42774318217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42774317221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21387159110 + 21387159111.

It is an arithmetic number, because the mean of its divisors is an integer number (21387159111).

Almost surely, 2^42774318221 is an apocalyptic number.

It is an amenable number.

42774318221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42774318221 is an equidigital number, since it uses as much as digits as its factorization.

42774318221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The spelling of 42774318221 in words is "forty-two billion, seven hundred seventy-four million, three hundred eighteen thousand, two hundred twenty-one".