42400220021 has 16 divisors (see below), whose sum is σ = 44540948736. Its totient is φ = 40284706176.

The previous prime is 42400219973. The next prime is 42400220029. The reversal of 42400220021 is 12002200424.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42400220021 - 2²² = 42396025717 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 (42400220029) 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 15 ways as a sum of consecutive naturals, for example, 4861961 + ... + 4870673.

It is an arithmetic number, because the mean of its divisors is an integer number (2783809296).

Almost surely, 2^42400220021 is an apocalyptic number.

It is an amenable number.

42400220021 is a deficient number, since it is larger than the sum of its proper divisors (2140728715).

42400220021 is a wasteful number, since it uses less digits than its factorization.

42400220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10132.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 42400220021 its reverse (12002200424), we get a palindrome (54402420445).

The spelling of 42400220021 in words is "forty-two billion, four hundred million, two hundred twenty thousand, twenty-one".