142013521 has 4 divisors (see below), whose sum is σ = 152937652. Its totient is φ = 131089392.

The previous prime is 142013519. The next prime is 142013533. The reversal of 142013521 is 125310241.

142013521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125310241 = 7 ⋅17901463.

It can be written as a sum of positive squares in 2 ways, for example, as 78588225 + 63425296 = 8865^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 142013521 - 2¹ = 142013519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142013591) 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, 5462046 + ... + 5462071.

It is an arithmetic number, because the mean of its divisors is an integer number (38234413).

Almost surely, 2^142013521 is an apocalyptic number.

It is an amenable number.

142013521 is a deficient number, since it is larger than the sum of its proper divisors (10924131).

142013521 is a wasteful number, since it uses less digits than its factorization.

142013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10924130.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 142013521 is about 11916.9426028659. The cubic root of 142013521 is about 521.7269028945.

Adding to 142013521 its reverse (125310241), we get a palindrome (267323762).

It can be divided in two parts, 1420 and 13521, that added together give a palindrome (14941).

The spelling of 142013521 in words is "one hundred forty-two million, thirteen thousand, five hundred twenty-one".