142201521 has 32 divisors (see below), whose sum is σ = 262656000. Its totient is φ = 73869840.

The previous prime is 142201513. The next prime is 142201523. The reversal of 142201521 is 125102241.

142201521 is a `hidden beast` number, since 142 + 2 + 0 + 1 + 521 = 666.

142201521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142201521 - 2³ = 142201513 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142201494 and 142201503.

It is not an unprimeable number, because it can be changed into a prime (142201523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32121 + ... + 36278.

It is an arithmetic number, because the mean of its divisors is an integer number (8208000).

Almost surely, 2^142201521 is an apocalyptic number.

142201521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142201521 is a deficient number, since it is larger than the sum of its proper divisors (120454479).

142201521 is a wasteful number, since it uses less digits than its factorization.

142201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68426 (or 68420 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 142201521 is about 11924.8279232868. The cubic root of 142201521 is about 521.9570251317.

Adding to 142201521 its reverse (125102241), we get a palindrome (267303762).

The spelling of 142201521 in words is "one hundred forty-two million, two hundred one thousand, five hundred twenty-one".