42321022021 has 4 divisors (see below), whose sum is σ = 42473805772. Its totient is φ = 42168238272.

The previous prime is 42321021991. The next prime is 42321022033. The reversal of 42321022021 is 12022012324.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7037532100 + 35283489921 = 83890^2 + 187839^2 .

It is a cyclic number.

It is not a de Polignac number, because 42321022021 - 2¹¹ = 42321019973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42321022021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42321022721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76391460 + ... + 76392013.

It is an arithmetic number, because the mean of its divisors is an integer number (10618451443).

Almost surely, 2^42321022021 is an apocalyptic number.

It is an amenable number.

42321022021 is a deficient number, since it is larger than the sum of its proper divisors (152783751).

42321022021 is a wasteful number, since it uses less digits than its factorization.

42321022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152783750.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 42321022021 its reverse (12022012324), we get a palindrome (54343034345).

The spelling of 42321022021 in words is "forty-two billion, three hundred twenty-one million, twenty-two thousand, twenty-one".