142133021 has 4 divisors (see below), whose sum is σ = 145974492. Its totient is φ = 138291552.

The previous prime is 142133011. The next prime is 142133023. The reversal of 142133021 is 120331241.

142133021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105288121 + 36844900 = 10261^2 + 6070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142133021 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 (142133023) 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, 1920680 + ... + 1920753.

It is an arithmetic number, because the mean of its divisors is an integer number (36493623).

Almost surely, 2^142133021 is an apocalyptic number.

It is an amenable number.

142133021 is a deficient number, since it is larger than the sum of its proper divisors (3841471).

142133021 is an equidigital number, since it uses as much as digits as its factorization.

142133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841470.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 142133021 is about 11921.9554184706. The cubic root of 142133021 is about 521.8732009022.

Adding to 142133021 its reverse (120331241), we get a palindrome (262464262).

The spelling of 142133021 in words is "one hundred forty-two million, one hundred thirty-three thousand, twenty-one".