140406223521 has 4 divisors (see below), whose sum is σ = 187208298032. Its totient is φ = 93604149012.

The previous prime is 140406223493. The next prime is 140406223547. The reversal of 140406223521 is 125322604041.

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: 125322604041 = 3 ⋅41774201347.

It is not a de Polignac number, because 140406223521 - 2¹⁵ = 140406190753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140406223571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23401037251 + ... + 23401037256.

It is an arithmetic number, because the mean of its divisors is an integer number (46802074508).

Almost surely, 2^140406223521 is an apocalyptic number.

It is an amenable number.

140406223521 is a deficient number, since it is larger than the sum of its proper divisors (46802074511).

140406223521 is an equidigital number, since it uses as much as digits as its factorization.

140406223521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46802074510.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 140406223521 its reverse (125322604041), we get a palindrome (265728827562).

The spelling of 140406223521 in words is "one hundred forty billion, four hundred six million, two hundred twenty-three thousand, five hundred twenty-one".