42850447649921 has 2 divisors, whose sum is σ = 42850447649922. Its totient is φ = 42850447649920.

The previous prime is 42850447649909. The next prime is 42850447650007. The reversal of 42850447649921 is 12994674405824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38513058280321 + 4337389369600 = 6205889^2 + 2082640^2 .

It is a cyclic number.

It is not a de Polignac number, because 42850447649921 - 2¹⁸ = 42850447387777 is a prime.

It is not a weakly prime, because it can be changed into another prime (42850447649521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21425223824960 + 21425223824961.

It is an arithmetic number, because the mean of its divisors is an integer number (21425223824961).

Almost surely, 2^{42850447649921} is an apocalyptic number.

It is an amenable number.

42850447649921 is a deficient number, since it is larger than the sum of its proper divisors (1).

42850447649921 is an equidigital number, since it uses as much as digits as its factorization.

42850447649921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139345920, while the sum is 65.

The spelling of 42850447649921 in words is "forty-two trillion, eight hundred fifty billion, four hundred forty-seven million, six hundred forty-nine thousand, nine hundred twenty-one".