42228464821 has 2 divisors, whose sum is σ = 42228464822. Its totient is φ = 42228464820.

The previous prime is 42228464779. The next prime is 42228464867. The reversal of 42228464821 is 12846482224.

42228464821 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., 41965571025 + 262893796 = 204855^2 + 16214^2 .

It is a cyclic number.

It is not a de Polignac number, because 42228464821 - 2¹³ = 42228456629 is a prime.

It is a super-2 number, since 2×42228464821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42228464021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21114232410 + 21114232411.

It is an arithmetic number, because the mean of its divisors is an integer number (21114232411).

Almost surely, 2^42228464821 is an apocalyptic number.

It is an amenable number.

42228464821 is a deficient number, since it is larger than the sum of its proper divisors (1).

42228464821 is an equidigital number, since it uses as much as digits as its factorization.

42228464821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393216, while the sum is 43.

The spelling of 42228464821 in words is "forty-two billion, two hundred twenty-eight million, four hundred sixty-four thousand, eight hundred twenty-one".