42101110021 has 2 divisors, whose sum is σ = 42101110022. Its totient is φ = 42101110020.

The previous prime is 42101110003. The next prime is 42101110039. The reversal of 42101110021 is 12001110124.

It is a balanced prime because it is at equal distance from previous prime (42101110003) and next prime (42101110039).

It can be written as a sum of positive squares in only one way, i.e., 37283361921 + 4817748100 = 193089^2 + 69410^2 .

It is a cyclic number.

It is not a de Polignac number, because 42101110021 - 2⁷ = 42101109893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42101109983 and 42101110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42101110321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21050555010 + 21050555011.

It is an arithmetic number, because the mean of its divisors is an integer number (21050555011).

Almost surely, 2^42101110021 is an apocalyptic number.

It is an amenable number.

42101110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42101110021 is an equidigital number, since it uses as much as digits as its factorization.

42101110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 42101110021 its reverse (12001110124), we get a palindrome (54102220145).

The spelling of 42101110021 in words is "forty-two billion, one hundred one million, one hundred ten thousand, twenty-one".