140500021 has 2 divisors, whose sum is σ = 140500022. Its totient is φ = 140500020.

The previous prime is 140500013. The next prime is 140500033. The reversal of 140500021 is 120005041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115799121 + 24700900 = 10761^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 140500021 - 2³ = 140500013 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 140499974 and 140500010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140500051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70250010 + 70250011.

It is an arithmetic number, because the mean of its divisors is an integer number (70250011).

Almost surely, 2^140500021 is an apocalyptic number.

It is an amenable number.

140500021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140500021 is an equidigital number, since it uses as much as digits as its factorization.

140500021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 140500021 is about 11853.2704769612. The cubic root of 140500021 is about 519.8668557046.

Adding to 140500021 its reverse (120005041), we get a palindrome (260505062).

The spelling of 140500021 in words is "one hundred forty million, five hundred thousand, twenty-one".