42402143221 has 4 divisors (see below), whose sum is σ = 42982994572. Its totient is φ = 41821291872.

The previous prime is 42402143219. The next prime is 42402143233. The reversal of 42402143221 is 12234120424.

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 32795399025 + 9606744196 = 181095^2 + 98014^2 .

It is a cyclic number.

It is not a de Polignac number, because 42402143221 - 2¹ = 42402143219 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 (42402143261) 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, 290425566 + ... + 290425711.

It is an arithmetic number, because the mean of its divisors is an integer number (10745748643).

Almost surely, 2^42402143221 is an apocalyptic number.

It is an amenable number.

42402143221 is a deficient number, since it is larger than the sum of its proper divisors (580851351).

42402143221 is an equidigital number, since it uses as much as digits as its factorization.

42402143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580851350.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 42402143221 its reverse (12234120424), we get a palindrome (54636263645).

The spelling of 42402143221 in words is "forty-two billion, four hundred two million, one hundred forty-three thousand, two hundred twenty-one".