21013312307 has 8 divisors (see below), whose sum is σ = 22636004160. Its totient is φ = 19391518080.

The previous prime is 21013312303. The next prime is 21013312339. The reversal of 21013312307 is 70321331012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21013312307 - 2² = 21013312303 is a prime.

It is a super-2 number, since 2×21013312307² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013312303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175382 + ... + 269787.

It is an arithmetic number, because the mean of its divisors is an integer number (2829500520).

Almost surely, 2^21013312307 is an apocalyptic number.

21013312307 is a deficient number, since it is larger than the sum of its proper divisors (1622691853).

21013312307 is a wasteful number, since it uses less digits than its factorization.

21013312307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448813.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 21013312307 its reverse (70321331012), we get a palindrome (91334643319).

The spelling of 21013312307 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, three hundred seven".