140401021 has 2 divisors, whose sum is σ = 140401022. Its totient is φ = 140401020.

The previous prime is 140400991. The next prime is 140401043. The reversal of 140401021 is 120104041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128936025 + 11464996 = 11355^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 140401021 - 2⁷ = 140400893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 140400992 and 140401010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140404021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70200510 + 70200511.

It is an arithmetic number, because the mean of its divisors is an integer number (70200511).

Almost surely, 2^140401021 is an apocalyptic number.

It is an amenable number.

140401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140401021 is an equidigital number, since it uses as much as digits as its factorization.

140401021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 140401021 is about 11849.0936784211. The cubic root of 140401021 is about 519.7447230735.

Adding to 140401021 its reverse (120104041), we get a palindrome (260505062).

The spelling of 140401021 in words is "one hundred forty million, four hundred one thousand, twenty-one".