140736221 has 4 divisors (see below), whose sum is σ = 141244572. Its totient is φ = 140227872.

The previous prime is 140736203. The next prime is 140736263. The reversal of 140736221 is 122637041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122637041 = 277 ⋅442733.

It can be written as a sum of positive squares in 2 ways, for example, as 22231225 + 118504996 = 4715^2 + 10886^2 .

It is a cyclic number.

It is not a de Polignac number, because 140736221 - 2⁶ = 140736157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140756221) 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, 253760 + ... + 254313.

It is an arithmetic number, because the mean of its divisors is an integer number (35311143).

Almost surely, 2^140736221 is an apocalyptic number.

It is an amenable number.

140736221 is a deficient number, since it is larger than the sum of its proper divisors (508351).

140736221 is an equidigital number, since it uses as much as digits as its factorization.

140736221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508350.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 140736221 is about 11863.2297878782. The cubic root of 140736221 is about 520.1580153410.

The spelling of 140736221 in words is "one hundred forty million, seven hundred thirty-six thousand, two hundred twenty-one".