142515421 has 4 divisors (see below), whose sum is σ = 145547712. Its totient is φ = 139483132.

The previous prime is 142515413. The next prime is 142515427. The reversal of 142515421 is 124515241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124515241 = 29 ⋅4293629.

It is a cyclic number.

It is not a de Polignac number, because 142515421 - 2³ = 142515413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142515427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516075 + ... + 1516168.

It is an arithmetic number, because the mean of its divisors is an integer number (36386928).

Almost surely, 2^142515421 is an apocalyptic number.

It is an amenable number.

142515421 is a deficient number, since it is larger than the sum of its proper divisors (3032291).

142515421 is an equidigital number, since it uses as much as digits as its factorization.

142515421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032290.

The product of its digits is 1600, while the sum is 25.

The square root of 142515421 is about 11937.9822834514. The cubic root of 142515421 is about 522.3408041982.

The spelling of 142515421 in words is "one hundred forty-two million, five hundred fifteen thousand, four hundred twenty-one".