142621441 has 4 divisors (see below), whose sum is σ = 143297584. Its totient is φ = 141945300.

The previous prime is 142621417. The next prime is 142621471. The reversal of 142621441 is 144126241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144126241 = 7 ⋅20589463.

It is a cyclic number.

It is not a de Polignac number, because 142621441 - 2²¹ = 140524289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142621471) 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, 337755 + ... + 338176.

It is an arithmetic number, because the mean of its divisors is an integer number (35824396).

Almost surely, 2^142621441 is an apocalyptic number.

It is an amenable number.

142621441 is a deficient number, since it is larger than the sum of its proper divisors (676143).

142621441 is an equidigital number, since it uses as much as digits as its factorization.

142621441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676142.

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

The square root of 142621441 is about 11942.4219067993. The cubic root of 142621441 is about 522.4702985948.

Adding to 142621441 its reverse (144126241), we get a palindrome (286747682).

The spelling of 142621441 in words is "one hundred forty-two million, six hundred twenty-one thousand, four hundred forty-one".