42342420021 has 32 divisors (see below), whose sum is σ = 64297411200. Its totient is φ = 24549799680.

The previous prime is 42342420019. The next prime is 42342420031. The reversal of 42342420021 is 12002424324.

It is not a de Polignac number, because 42342420021 - 2¹ = 42342420019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42342419973 and 42342420000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42342420031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98646 + ... + 307271.

It is an arithmetic number, because the mean of its divisors is an integer number (2009294100).

Almost surely, 2^42342420021 is an apocalyptic number.

It is an amenable number.

42342420021 is a deficient number, since it is larger than the sum of its proper divisors (21954991179).

42342420021 is a wasteful number, since it uses less digits than its factorization.

42342420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406069.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 42342420021 its reverse (12002424324), we get a palindrome (54344844345).

The spelling of 42342420021 in words is "forty-two billion, three hundred forty-two million, four hundred twenty thousand, twenty-one".