140123221 has 4 divisors (see below), whose sum is σ = 160140832. Its totient is φ = 120105612.

The previous prime is 140123183. The next prime is 140123239. The reversal of 140123221 is 122321041.

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: 122321041 = 3137 ⋅38993.

It is a cyclic number.

It is not a de Polignac number, because 140123221 - 2¹⁹ = 139598933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140123195 and 140123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140123251) 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, 10008795 + ... + 10008808.

It is an arithmetic number, because the mean of its divisors is an integer number (40035208).

Almost surely, 2^140123221 is an apocalyptic number.

It is an amenable number.

140123221 is a deficient number, since it is larger than the sum of its proper divisors (20017611).

140123221 is an equidigital number, since it uses as much as digits as its factorization.

140123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20017610.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 140123221 is about 11837.3654585807. The cubic root of 140123221 is about 519.4017046360.

Adding to 140123221 its reverse (122321041), we get a palindrome (262444262).

The spelling of 140123221 in words is "one hundred forty million, one hundred twenty-three thousand, two hundred twenty-one".