142417236821 has 4 divisors (see below), whose sum is σ = 142419564012. Its totient is φ = 142414909632.

The previous prime is 142417236737. The next prime is 142417236853. The reversal of 142417236821 is 128632714241.

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 57450816721 + 84966420100 = 239689^2 + 291490^2 .

It is a de Polignac number, because none of the positive numbers 2^k-142417236821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142417230821) 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 3 ways as a sum of consecutive naturals, for example, 1069250 + ... + 1195043.

It is an arithmetic number, because the mean of its divisors is an integer number (35604891003).

Almost surely, 2^142417236821 is an apocalyptic number.

It is an amenable number.

142417236821 is a deficient number, since it is larger than the sum of its proper divisors (2327191).

142417236821 is an equidigital number, since it uses as much as digits as its factorization.

142417236821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327190.

The product of its digits is 129024, while the sum is 41.

The spelling of 142417236821 in words is "one hundred forty-two billion, four hundred seventeen million, two hundred thirty-six thousand, eight hundred twenty-one".