140424421 has 4 divisors (see below), whose sum is σ = 147815200. Its totient is φ = 133033644.

The previous prime is 140424419. The next prime is 140424491. The reversal of 140424421 is 124424041.

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: 124424041 = 7 ⋅17774863.

It is a cyclic number.

It is not a de Polignac number, because 140424421 - 2¹ = 140424419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140424392 and 140424401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140424491) 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, 3695361 + ... + 3695398.

It is an arithmetic number, because the mean of its divisors is an integer number (36953800).

Almost surely, 2^140424421 is an apocalyptic number.

It is an amenable number.

140424421 is a deficient number, since it is larger than the sum of its proper divisors (7390779).

140424421 is an equidigital number, since it uses as much as digits as its factorization.

140424421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7390778.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 140424421 is about 11850.0810545751. The cubic root of 140424421 is about 519.7735959663.

Adding to 140424421 its reverse (124424041), we get a palindrome (264848462).

The spelling of 140424421 in words is "one hundred forty million, four hundred twenty-four thousand, four hundred twenty-one".