140310021 has 4 divisors (see below), whose sum is σ = 187080032. Its totient is φ = 93540012.

The previous prime is 140310019. The next prime is 140310029. The reversal of 140310021 is 120013041.

It is a happy number.

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.

It is not a de Polignac number, because 140310021 - 2¹ = 140310019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140309979 and 140310006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140310029) 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, 23385001 + ... + 23385006.

It is an arithmetic number, because the mean of its divisors is an integer number (46770008).

Almost surely, 2^140310021 is an apocalyptic number.

It is an amenable number.

140310021 is a deficient number, since it is larger than the sum of its proper divisors (46770011).

140310021 is an equidigital number, since it uses as much as digits as its factorization.

140310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46770010.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 140310021 is about 11845.2530998709. The cubic root of 140310021 is about 519.6324090948.

Adding to 140310021 its reverse (120013041), we get a palindrome (260323062).

The spelling of 140310021 in words is "one hundred forty million, three hundred ten thousand, twenty-one".