140321021 has 2 divisors, whose sum is σ = 140321022. Its totient is φ = 140321020.

The previous prime is 140320987. The next prime is 140321081. The reversal of 140321021 is 120123041.

140321021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 38613796 = 10085^2 + 6214^2 .

It is an emirp because it is prime and its reverse (120123041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140321021 - 2²⁶ = 73212157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 140320987 and 140321005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140321081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70160510 + 70160511.

It is an arithmetic number, because the mean of its divisors is an integer number (70160511).

Almost surely, 2^140321021 is an apocalyptic number.

It is an amenable number.

140321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140321021 is an equidigital number, since it uses as much as digits as its factorization.

140321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 140321021 is about 11845.7174117906. The cubic root of 140321021 is about 519.6459880896.

Adding to 140321021 its reverse (120123041), we get a palindrome (260444062).

The spelling of 140321021 in words is "one hundred forty million, three hundred twenty-one thousand, twenty-one".