140065021 has 2 divisors, whose sum is σ = 140065022. Its totient is φ = 140065020.

The previous prime is 140064973. The next prime is 140065031. The reversal of 140065021 is 120560041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128572921 + 11492100 = 11339^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 140065021 - 2¹⁵ = 140032253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140065021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140065031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70032510 + 70032511.

It is an arithmetic number, because the mean of its divisors is an integer number (70032511).

Almost surely, 2^140065021 is an apocalyptic number.

It is an amenable number.

140065021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140065021 is an equidigital number, since it uses as much as digits as its factorization.

140065021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 140065021 is about 11834.9068859877. The cubic root of 140065021 is about 519.3297837338.

The spelling of 140065021 in words is "one hundred forty million, sixty-five thousand, twenty-one".