142021115521 has 4 divisors (see below), whose sum is σ = 142023147012. Its totient is φ = 142019084032.

The previous prime is 142021115497. The next prime is 142021115569. The reversal of 142021115521 is 125511120241.

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 36094300225 + 105926815296 = 189985^2 + 325464^2 .

It is a cyclic number.

It is not a de Polignac number, because 142021115521 - 2¹¹ = 142021113473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142021115591) 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, 907000 + ... + 1051993.

It is an arithmetic number, because the mean of its divisors is an integer number (35505786753).

Almost surely, 2^142021115521 is an apocalyptic number.

It is an amenable number.

142021115521 is a deficient number, since it is larger than the sum of its proper divisors (2031491).

142021115521 is an equidigital number, since it uses as much as digits as its factorization.

142021115521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031490.

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 142021115521 its reverse (125511120241), we get a palindrome (267532235762).

The spelling of 142021115521 in words is "one hundred forty-two billion, twenty-one million, one hundred fifteen thousand, five hundred twenty-one".