142944021 has 48 divisors (see below), whose sum is σ = 238230720. Its totient is φ = 84913920.

The previous prime is 142944013. The next prime is 142944029. The reversal of 142944021 is 120449241.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (142944013) and next prime (142944029).

It is not a de Polignac number, because 142944021 - 2³ = 142944013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142944029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141165 + ... + 142173.

It is an arithmetic number, because the mean of its divisors is an integer number (4963140).

Almost surely, 2^142944021 is an apocalyptic number.

142944021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142944021 is a deficient number, since it is larger than the sum of its proper divisors (95286699).

142944021 is a wasteful number, since it uses less digits than its factorization.

142944021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 142944021 is about 11955.9199144190. The cubic root of 142944021 is about 522.8639083280.

The spelling of 142944021 in words is "one hundred forty-two million, nine hundred forty-four thousand, twenty-one".