42032140021 has 4 divisors (see below), whose sum is σ = 42037832812. Its totient is φ = 42026447232.

The previous prime is 42032140013. The next prime is 42032140039. The reversal of 42032140021 is 12004123024.

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 4980124900 + 37052015121 = 70570^2 + 192489^2 .

It is a cyclic number.

It is not a de Polignac number, because 42032140021 - 2³ = 42032140013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42032147021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2835306 + ... + 2850091.

It is an arithmetic number, because the mean of its divisors is an integer number (10509458203).

Almost surely, 2^42032140021 is an apocalyptic number.

It is an amenable number.

42032140021 is a deficient number, since it is larger than the sum of its proper divisors (5692791).

42032140021 is an equidigital number, since it uses as much as digits as its factorization.

42032140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692790.

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

Adding to 42032140021 its reverse (12004123024), we get a palindrome (54036263045).

The spelling of 42032140021 in words is "forty-two billion, thirty-two million, one hundred forty thousand, twenty-one".