140402321 has 2 divisors, whose sum is σ = 140402322. Its totient is φ = 140402320.

The previous prime is 140402299. The next prime is 140402323. The reversal of 140402321 is 123204041.

140402321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133171600 + 7230721 = 11540^2 + 2689^2 .

It is an emirp because it is prime and its reverse (123204041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140402321 - 2⁶ = 140402257 is a prime.

Together with 140402323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140402321.

It is not a weakly prime, because it can be changed into another prime (140402323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70201160 + 70201161.

It is an arithmetic number, because the mean of its divisors is an integer number (70201161).

Almost surely, 2^140402321 is an apocalyptic number.

It is an amenable number.

140402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

140402321 is an equidigital number, since it uses as much as digits as its factorization.

140402321 is an evil number, because the sum of its binary digits is even.

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

The square root of 140402321 is about 11849.1485348104. The cubic root of 140402321 is about 519.7463272072.

Adding to 140402321 its reverse (123204041), we get a palindrome (263606362).

It can be divided in two parts, 14040 and 2321, that added together give a palindrome (16361).

The spelling of 140402321 in words is "one hundred forty million, four hundred two thousand, three hundred twenty-one".