140304221 has 4 divisors (see below), whose sum is σ = 140720892. Its totient is φ = 139887552.

The previous prime is 140304187. The next prime is 140304223. The reversal of 140304221 is 122403041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122403041 = 4937 ⋅24793.

It can be written as a sum of positive squares in 2 ways, for example, as 37687321 + 102616900 = 6139^2 + 10130^2 .

It is a cyclic number.

It is not a de Polignac number, because 140304221 - 2²⁶ = 73195357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140304221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140304223) 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, 207830 + ... + 208503.

It is an arithmetic number, because the mean of its divisors is an integer number (35180223).

Almost surely, 2^140304221 is an apocalyptic number.

It is an amenable number.

140304221 is a deficient number, since it is larger than the sum of its proper divisors (416671).

140304221 is an equidigital number, since it uses as much as digits as its factorization.

140304221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416670.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 140304221 is about 11845.0082735302. The cubic root of 140304221 is about 519.6252489754.

Adding to 140304221 its reverse (122403041), we get a palindrome (262707262).

The spelling of 140304221 in words is "one hundred forty million, three hundred four thousand, two hundred twenty-one".