21364639307 has 12 divisors (see below), whose sum is σ = 23487147768. Its totient is φ = 19419338400.

The previous prime is 21364639267. The next prime is 21364639321. The reversal of 21364639307 is 70393646312.

It is not a de Polignac number, because 21364639307 - 2¹⁶ = 21364573771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21364639337) 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 11 ways as a sum of consecutive naturals, for example, 1175207 + ... + 1193247.

It is an arithmetic number, because the mean of its divisors is an integer number (1957262314).

Almost surely, 2^21364639307 is an apocalyptic number.

21364639307 is a deficient number, since it is larger than the sum of its proper divisors (2122508461).

21364639307 is a wasteful number, since it uses less digits than its factorization.

21364639307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27850 (or 27839 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 44.

The spelling of 21364639307 in words is "twenty-one billion, three hundred sixty-four million, six hundred thirty-nine thousand, three hundred seven".