142121130221 has 12 divisors (see below), whose sum is σ = 166787635932. Its totient is φ = 120740070528.

The previous prime is 142121130167. The next prime is 142121130223. The reversal of 142121130221 is 122031121241.

It can be written as a sum of positive squares in 2 ways, for example, as 48845862121 + 93275268100 = 221011^2 + 305410^2 .

It is not a de Polignac number, because 142121130221 - 2⁶ = 142121130157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142121130193 and 142121130202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142121130223) 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 11 ways as a sum of consecutive naturals, for example, 12828230 + ... + 12839303.

It is an arithmetic number, because the mean of its divisors is an integer number (13898969661).

Almost surely, 2^142121130221 is an apocalyptic number.

It is an amenable number.

142121130221 is a deficient number, since it is larger than the sum of its proper divisors (24666505711).

142121130221 is a wasteful number, since it uses less digits than its factorization.

142121130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25667660 (or 25667653 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 142121130221 its reverse (122031121241), we get a palindrome (264152251462).

The spelling of 142121130221 in words is "one hundred forty-two billion, one hundred twenty-one million, one hundred thirty thousand, two hundred twenty-one".