42221412421 has 4 divisors (see below), whose sum is σ = 42656684812. Its totient is φ = 41786140032.

The previous prime is 42221412407. The next prime is 42221412433. The reversal of 42221412421 is 12421412224.

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 30107108196 + 12114304225 = 173514^2 + 110065^2 .

It is a cyclic number.

It is not a de Polignac number, because 42221412421 - 2¹³ = 42221404229 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 (42221412481) 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, 217636050 + ... + 217636243.

It is an arithmetic number, because the mean of its divisors is an integer number (10664171203).

Almost surely, 2^42221412421 is an apocalyptic number.

It is an amenable number.

42221412421 is a deficient number, since it is larger than the sum of its proper divisors (435272391).

42221412421 is an equidigital number, since it uses as much as digits as its factorization.

42221412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435272390.

The product of its digits is 2048, while the sum is 25.

Adding to 42221412421 its reverse (12421412224), we get a palindrome (54642824645).

The spelling of 42221412421 in words is "forty-two billion, two hundred twenty-one million, four hundred twelve thousand, four hundred twenty-one".