142236421 has 4 divisors (see below), whose sum is σ = 145705644. Its totient is φ = 138767200.

The previous prime is 142236407. The next prime is 142236427. The reversal of 142236421 is 124632241.

It is a happy number.

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 61936900 + 80299521 = 7870^2 + 8961^2 .

It is a cyclic number.

It is not a de Polignac number, because 142236421 - 2⁷ = 142236293 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 (142236427) 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 3 ways as a sum of consecutive naturals, for example, 1734550 + ... + 1734631.

It is an arithmetic number, because the mean of its divisors is an integer number (36426411).

Almost surely, 2^142236421 is an apocalyptic number.

It is an amenable number.

142236421 is a deficient number, since it is larger than the sum of its proper divisors (3469223).

142236421 is an equidigital number, since it uses as much as digits as its factorization.

142236421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469222.

The product of its digits is 2304, while the sum is 25.

The square root of 142236421 is about 11926.2911669974. The cubic root of 142236421 is about 521.9997223077. Note that the first 3 decimals are identical.

Adding to 142236421 its reverse (124632241), we get a palindrome (266868662).

The spelling of 142236421 in words is "one hundred forty-two million, two hundred thirty-six thousand, four hundred twenty-one".