140134021 has 2 divisors, whose sum is σ = 140134022. Its totient is φ = 140134020.

The previous prime is 140133967. The next prime is 140134037. The reversal of 140134021 is 120431041.

It is an a-pointer prime, because the next prime (140134037) can be obtained adding 140134021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134908225 + 5225796 = 11615^2 + 2286^2 .

It is a cyclic number.

It is not a de Polignac number, because 140134021 - 2⁹ = 140133509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 140133986 and 140134004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140134321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70067010 + 70067011.

It is an arithmetic number, because the mean of its divisors is an integer number (70067011).

Almost surely, 2^140134021 is an apocalyptic number.

It is an amenable number.

140134021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140134021 is an equidigital number, since it uses as much as digits as its factorization.

140134021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 140134021 is about 11837.8216323781. The cubic root of 140134021 is about 519.4150485920.

Adding to 140134021 its reverse (120431041), we get a palindrome (260565062).

The spelling of 140134021 in words is "one hundred forty million, one hundred thirty-four thousand, twenty-one".