42031020021 has 8 divisors (see below), whose sum is σ = 56444535840. Its totient is φ = 27819092112.

The previous prime is 42031019941. The next prime is 42031020023. The reversal of 42031020021 is 12002013024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42031020021 - 2¹⁸ = 42030757877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42031020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50396490 + ... + 50397323.

It is an arithmetic number, because the mean of its divisors is an integer number (7055566980).

Almost surely, 2^42031020021 is an apocalyptic number.

It is an amenable number.

42031020021 is a deficient number, since it is larger than the sum of its proper divisors (14413515819).

42031020021 is a wasteful number, since it uses less digits than its factorization.

42031020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100793955.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 42031020021 its reverse (12002013024), we get a palindrome (54033033045).

The spelling of 42031020021 in words is "forty-two billion, thirty-one million, twenty thousand, twenty-one".