140023021 has 4 divisors (see below), whose sum is σ = 140465052. Its totient is φ = 139580992.

The previous prime is 140022977. The next prime is 140023043. The reversal of 140023021 is 120320041.

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 54552996 + 85470025 = 7386^2 + 9245^2 .

It is a cyclic number.

It is not a de Polignac number, because 140023021 - 2¹¹ = 140020973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140022992 and 140023010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140023061) 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, 220540 + ... + 221173.

It is an arithmetic number, because the mean of its divisors is an integer number (35116263).

Almost surely, 2^140023021 is an apocalyptic number.

It is an amenable number.

140023021 is a deficient number, since it is larger than the sum of its proper divisors (442031).

140023021 is an equidigital number, since it uses as much as digits as its factorization.

140023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442030.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 140023021 is about 11833.1323410161. The cubic root of 140023021 is about 519.2778696745.

Adding to 140023021 its reverse (120320041), we get a palindrome (260343062).

The spelling of 140023021 in words is "one hundred forty million, twenty-three thousand, twenty-one".