140140421 has 4 divisors (see below), whose sum is σ = 140447532. Its totient is φ = 139833312.

The previous prime is 140140411. The next prime is 140140463. The reversal of 140140421 is 124041041.

140140421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124041041 = 53 ⋅2340397.

It can be written as a sum of positive squares in 2 ways, for example, as 105165025 + 34975396 = 10255^2 + 5914^2 .

It is a cyclic number.

It is not a de Polignac number, because 140140421 - 2²² = 135946117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 140140421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140140411) 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, 152870 + ... + 153783.

It is an arithmetic number, because the mean of its divisors is an integer number (35111883).

Almost surely, 2^140140421 is an apocalyptic number.

It is an amenable number.

140140421 is a deficient number, since it is larger than the sum of its proper divisors (307111).

140140421 is an equidigital number, since it uses as much as digits as its factorization.

140140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307110.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 140140421 is about 11838.0919492966. The cubic root of 140140421 is about 519.4229557980.

Adding to 140140421 its reverse (124041041), we get a palindrome (264181462).

The spelling of 140140421 in words is "one hundred forty million, one hundred forty thousand, four hundred twenty-one".