42342351644221 has 8 divisors (see below), whose sum is σ = 42391324301144. Its totient is φ = 42293380564800.

The previous prime is 42342351644147. The next prime is 42342351644231. The reversal of 42342351644221 is 12244615324324.

It can be written as a sum of positive squares in 4 ways, for example, as 22434148060900 + 19908203583321 = 4736470^2 + 4461861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42342351644221 - 2²⁷ = 42342217426493 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 (42342351644231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58374871 + ... + 59095771.

It is an arithmetic number, because the mean of its divisors is an integer number (5298915537643).

Almost surely, 2^{42342351644221} is an apocalyptic number.

It is an amenable number.

42342351644221 is a deficient number, since it is larger than the sum of its proper divisors (48972656923).

42342351644221 is an equidigital number, since it uses as much as digits as its factorization.

42342351644221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788751.

The product of its digits is 1105920, while the sum is 43.

Adding to 42342351644221 its reverse (12244615324324), we get a palindrome (54586966968545).

The spelling of 42342351644221 in words is "forty-two trillion, three hundred forty-two billion, three hundred fifty-one million, six hundred forty-four thousand, two hundred twenty-one".