142023421 has 4 divisors (see below), whose sum is σ = 142127644. Its totient is φ = 141919200.

The previous prime is 142023397. The next prime is 142023439. The reversal of 142023421 is 124320241.

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 111619225 + 30404196 = 10565^2 + 5514^2 .

It is a cyclic number.

It is not a de Polignac number, because 142023421 - 2⁷ = 142023293 is a prime.

It is a super-2 number, since 2×142023421² = 40341304225086482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142023481) 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, 50040 + ... + 52801.

It is an arithmetic number, because the mean of its divisors is an integer number (35531911).

Almost surely, 2^142023421 is an apocalyptic number.

It is an amenable number.

142023421 is a deficient number, since it is larger than the sum of its proper divisors (104223).

142023421 is a wasteful number, since it uses less digits than its factorization.

142023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104222.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 142023421 is about 11917.3579706242. The cubic root of 142023421 is about 521.7390260977.

Adding to 142023421 its reverse (124320241), we get a palindrome (266343662).

The spelling of 142023421 in words is "one hundred forty-two million, twenty-three thousand, four hundred twenty-one".