21369740307 has 4 divisors (see below), whose sum is σ = 28492987080. Its totient is φ = 14246493536.

The previous prime is 21369740251. The next prime is 21369740347. The reversal of 21369740307 is 70304796312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21369740307 - 2²³ = 21361351699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21369740347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3561623382 + ... + 3561623387.

It is an arithmetic number, because the mean of its divisors is an integer number (7123246770).

Almost surely, 2^21369740307 is an apocalyptic number.

21369740307 is a deficient number, since it is larger than the sum of its proper divisors (7123246773).

21369740307 is an equidigital number, since it uses as much as digits as its factorization.

21369740307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7123246772.

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 21369740307 in words is "twenty-one billion, three hundred sixty-nine million, seven hundred forty thousand, three hundred seven".