42101222021 has 2 divisors, whose sum is σ = 42101222022. Its totient is φ = 42101222020.

The previous prime is 42101221937. The next prime is 42101222113. The reversal of 42101222021 is 12022210124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29141904100 + 12959317921 = 170710^2 + 113839^2 .

It is a cyclic number.

It is not a de Polignac number, because 42101222021 - 2²² = 42097027717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42106222021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21050611010 + 21050611011.

It is an arithmetic number, because the mean of its divisors is an integer number (21050611011).

Almost surely, 2^42101222021 is an apocalyptic number.

It is an amenable number.

42101222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42101222021 is an equidigital number, since it uses as much as digits as its factorization.

42101222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 42101222021 its reverse (12022210124), we get a palindrome (54123432145).

The spelling of 42101222021 in words is "forty-two billion, one hundred one million, two hundred twenty-two thousand, twenty-one".