42021103021 has 2 divisors, whose sum is σ = 42021103022. Its totient is φ = 42021103020.

The previous prime is 42021102913. The next prime is 42021103027. The reversal of 42021103021 is 12030112024.

42021103021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39168368100 + 2852734921 = 197910^2 + 53411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42021103021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42021102986 and 42021103004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42021103027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010551510 + 21010551511.

It is an arithmetic number, because the mean of its divisors is an integer number (21010551511).

Almost surely, 2^42021103021 is an apocalyptic number.

It is an amenable number.

42021103021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021103021 is an equidigital number, since it uses as much as digits as its factorization.

42021103021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 42021103021 its reverse (12030112024), we get a palindrome (54051215045).

The spelling of 42021103021 in words is "forty-two billion, twenty-one million, one hundred three thousand, twenty-one".