142736021 has 8 divisors (see below), whose sum is σ = 143626560. Its totient is φ = 141848928.

The previous prime is 142735993. The next prime is 142736051. The reversal of 142736021 is 120637241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142736021 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 (142736051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151865 + ... + 152801.

It is an arithmetic number, because the mean of its divisors is an integer number (17953320).

Almost surely, 2^142736021 is an apocalyptic number.

It is an amenable number.

142736021 is a deficient number, since it is larger than the sum of its proper divisors (890539).

142736021 is an equidigital number, since it uses as much as digits as its factorization.

142736021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 142736021 is about 11947.2181280832. The cubic root of 142736021 is about 522.6101761664.

The spelling of 142736021 in words is "one hundred forty-two million, seven hundred thirty-six thousand, twenty-one".