140021420509 has 2 divisors, whose sum is σ = 140021420510. Its totient is φ = 140021420508.

The previous prime is 140021420507. The next prime is 140021420543. The reversal of 140021420509 is 905024120041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91004788900 + 49016631609 = 301670^2 + 221397^2 .

It is a cyclic number.

It is not a de Polignac number, because 140021420509 - 2¹ = 140021420507 is a prime.

Together with 140021420507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140021420507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70010710254 + 70010710255.

It is an arithmetic number, because the mean of its divisors is an integer number (70010710255).

Almost surely, 2^140021420509 is an apocalyptic number.

It is an amenable number.

140021420509 is a deficient number, since it is larger than the sum of its proper divisors (1).

140021420509 is an equidigital number, since it uses as much as digits as its factorization.

140021420509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 140021420509 in words is "one hundred forty billion, twenty-one million, four hundred twenty thousand, five hundred nine".