142521443 has 4 divisors (see below), whose sum is σ = 142582968. Its totient is φ = 142459920.

The previous prime is 142521433. The next prime is 142521461. The reversal of 142521443 is 344125241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142521443 - 2¹⁰ = 142520419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142521433) 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, 27146 + ... + 31967.

It is an arithmetic number, because the mean of its divisors is an integer number (35645742).

Almost surely, 2^142521443 is an apocalyptic number.

142521443 is a deficient number, since it is larger than the sum of its proper divisors (61525).

142521443 is an equidigital number, since it uses as much as digits as its factorization.

142521443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61524.

The product of its digits is 3840, while the sum is 26.

The square root of 142521443 is about 11938.2345009637. The cubic root of 142521443 is about 522.3481612781.

Adding to 142521443 its reverse (344125241), we get a palindrome (486646684).

The spelling of 142521443 in words is "one hundred forty-two million, five hundred twenty-one thousand, four hundred forty-three".