142421641 has 4 divisors (see below), whose sum is σ = 144756484. Its totient is φ = 140086800.

The previous prime is 142421623. The next prime is 142421647. The reversal of 142421641 is 146124241.

142421641 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 2496400 + 139925241 = 1580^2 + 11829^2 .

It is a cyclic number.

It is not a de Polignac number, because 142421641 - 2¹³ = 142413449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142421647) 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, 1167330 + ... + 1167451.

It is an arithmetic number, because the mean of its divisors is an integer number (36189121).

Almost surely, 2^142421641 is an apocalyptic number.

It is an amenable number.

142421641 is a deficient number, since it is larger than the sum of its proper divisors (2334843).

142421641 is an equidigital number, since it uses as much as digits as its factorization.

142421641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334842.

The product of its digits is 1536, while the sum is 25.

The square root of 142421641 is about 11934.0538376530. The cubic root of 142421641 is about 522.2262063794.

Adding to 142421641 its reverse (146124241), we get a palindrome (288545882).

The spelling of 142421641 in words is "one hundred forty-two million, four hundred twenty-one thousand, six hundred forty-one".