140322821 has 2 divisors, whose sum is σ = 140322822. Its totient is φ = 140322820.

The previous prime is 140322761. The next prime is 140322841. The reversal of 140322821 is 128223041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125776225 + 14546596 = 11215^2 + 3814^2 .

It is an emirp because it is prime and its reverse (128223041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140322821 - 2⁶ = 140322757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140322841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70161410 + 70161411.

It is an arithmetic number, because the mean of its divisors is an integer number (70161411).

Almost surely, 2^140322821 is an apocalyptic number.

It is an amenable number.

140322821 is a deficient number, since it is larger than the sum of its proper divisors (1).

140322821 is an equidigital number, since it uses as much as digits as its factorization.

140322821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 140322821 is about 11845.7933883721. The cubic root of 140322821 is about 519.6482100393.

Adding to 140322821 its reverse (128223041), we get a palindrome (268545862).

The spelling of 140322821 in words is "one hundred forty million, three hundred twenty-two thousand, eight hundred twenty-one".