140995021 has 2 divisors, whose sum is σ = 140995022. Its totient is φ = 140995020.

The previous prime is 140995009. The next prime is 140995031. The reversal of 140995021 is 120599041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139004100 + 1990921 = 11790^2 + 1411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140995021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140995031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70497510 + 70497511.

It is an arithmetic number, because the mean of its divisors is an integer number (70497511).

Almost surely, 2^140995021 is an apocalyptic number.

It is an amenable number.

140995021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140995021 is an equidigital number, since it uses as much as digits as its factorization.

140995021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 140995021 is about 11874.1324314663. The cubic root of 140995021 is about 520.4766598281.

The spelling of 140995021 in words is "one hundred forty million, nine hundred ninety-five thousand, twenty-one".