142521001 has 4 divisors (see below), whose sum is σ = 162881152. Its totient is φ = 122160852.

The previous prime is 142520971. The next prime is 142521019. The reversal of 142521001 is 100125241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142521001 - 2⁵ = 142520969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142521091) 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, 10180065 + ... + 10180078.

It is an arithmetic number, because the mean of its divisors is an integer number (40720288).

Almost surely, 2^142521001 is an apocalyptic number.

It is an amenable number.

142521001 is a deficient number, since it is larger than the sum of its proper divisors (20360151).

142521001 is an equidigital number, since it uses as much as digits as its factorization.

142521001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20360150.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 142521001 is about 11938.2159889994. The cubic root of 142521001 is about 522.3476212936.

Adding to 142521001 its reverse (100125241), we get a palindrome (242646242).

The spelling of 142521001 in words is "one hundred forty-two million, five hundred twenty-one thousand, one".