42213100021 has 2 divisors, whose sum is σ = 42213100022. Its totient is φ = 42213100020.

The previous prime is 42213100009. The next prime is 42213100063. The reversal of 42213100021 is 12000131224.

42213100021 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., 35688499396 + 6524600625 = 188914^2 + 80775^2 .

It is a cyclic number.

It is not a de Polignac number, because 42213100021 - 2¹⁷ = 42212968949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42213099968 and 42213100004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42213100001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21106550010 + 21106550011.

It is an arithmetic number, because the mean of its divisors is an integer number (21106550011).

Almost surely, 2^42213100021 is an apocalyptic number.

It is an amenable number.

42213100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42213100021 is an equidigital number, since it uses as much as digits as its factorization.

42213100021 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 42213100021 its reverse (12000131224), we get a palindrome (54213231245).

The spelling of 42213100021 in words is "forty-two billion, two hundred thirteen million, one hundred thousand, twenty-one".