142111521 has 12 divisors (see below), whose sum is σ = 207746448. Its totient is φ = 93599064.

The previous prime is 142111511. The next prime is 142111523. The reversal of 142111521 is 125111241.

142111521 is a `hidden beast` number, since 142 + 1 + 1 + 1 + 521 = 666.

It is not a de Polignac number, because 142111521 - 2⁹ = 142111009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142111494 and 142111503.

It is not an unprimeable number, because it can be changed into a prime (142111523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94375 + ... + 95868.

It is an arithmetic number, because the mean of its divisors is an integer number (17312204).

Almost surely, 2^142111521 is an apocalyptic number.

It is an amenable number.

142111521 is a deficient number, since it is larger than the sum of its proper divisors (65634927).

142111521 is a wasteful number, since it uses less digits than its factorization.

142111521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190332 (or 190329 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 142111521 is about 11921.0536866504. The cubic root of 142111521 is about 521.8468855544.

Adding to 142111521 its reverse (125111241), we get a palindrome (267222762).

The spelling of 142111521 in words is "one hundred forty-two million, one hundred eleven thousand, five hundred twenty-one".