42000244021 has 16 divisors (see below), whose sum is σ = 44504467200. Its totient is φ = 39525789888.

The previous prime is 42000244019. The next prime is 42000244049. The reversal of 42000244021 is 12044200024.

It is a cyclic number.

It is not a de Polignac number, because 42000244021 - 2¹ = 42000244019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 42000244021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42000244001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4357035 + ... + 4366663.

It is an arithmetic number, because the mean of its divisors is an integer number (2781529200).

Almost surely, 2^42000244021 is an apocalyptic number.

It is an amenable number.

42000244021 is a deficient number, since it is larger than the sum of its proper divisors (2504223179).

42000244021 is a wasteful number, since it uses less digits than its factorization.

42000244021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11148.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 42000244021 its reverse (12044200024), we get a palindrome (54044444045).

The spelling of 42000244021 in words is "forty-two billion, two hundred forty-four thousand, twenty-one".