142253021 has 4 divisors (see below), whose sum is σ = 142619100. Its totient is φ = 141886944.

The previous prime is 142252967. The next prime is 142253047. The reversal of 142253021 is 120352241.

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 81631225 + 60621796 = 9035^2 + 7786^2 .

It is a cyclic number.

It is not a de Polignac number, because 142253021 - 2¹⁰ = 142251997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142252984 and 142253002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142253821) 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, 182456 + ... + 183233.

It is an arithmetic number, because the mean of its divisors is an integer number (35654775).

Almost surely, 2^142253021 is an apocalyptic number.

It is an amenable number.

142253021 is a deficient number, since it is larger than the sum of its proper divisors (366079).

142253021 is an equidigital number, since it uses as much as digits as its factorization.

142253021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366078.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 142253021 is about 11926.9870881124. The cubic root of 142253021 is about 522.0200285421.

The spelling of 142253021 in words is "one hundred forty-two million, two hundred fifty-three thousand, twenty-one".