142021133 has 4 divisors (see below), whose sum is σ = 145859580. Its totient is φ = 138182688.

The previous prime is 142021129. The next prime is 142021147. The reversal of 142021133 is 331120241.

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 134606404 + 7414729 = 11602^2 + 2723^2 .

It is a cyclic number.

It is not a de Polignac number, because 142021133 - 2² = 142021129 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 (142021153) 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, 1919168 + ... + 1919241.

It is an arithmetic number, because the mean of its divisors is an integer number (36464895).

Almost surely, 2^142021133 is an apocalyptic number.

It is an amenable number.

142021133 is a deficient number, since it is larger than the sum of its proper divisors (3838447).

142021133 is an equidigital number, since it uses as much as digits as its factorization.

142021133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838446.

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

The square root of 142021133 is about 11917.2619758064. The cubic root of 142021133 is about 521.7362243408.

Adding to 142021133 its reverse (331120241), we get a palindrome (473141374).

The spelling of 142021133 in words is "one hundred forty-two million, twenty-one thousand, one hundred thirty-three".