21301440739 has 2 divisors, whose sum is σ = 21301440740. Its totient is φ = 21301440738.

The previous prime is 21301440709. The next prime is 21301440757. The reversal of 21301440739 is 93704410312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21301440739 - 2¹⁵ = 21301407971 is a prime.

It is a super-2 number, since 2×21301440739² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21301440709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650720369 + 10650720370.

It is an arithmetic number, because the mean of its divisors is an integer number (10650720370).

Almost surely, 2^21301440739 is an apocalyptic number.

21301440739 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301440739 is an equidigital number, since it uses as much as digits as its factorization.

21301440739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21301440739 in words is "twenty-one billion, three hundred one million, four hundred forty thousand, seven hundred thirty-nine".