21329808313 has 4 divisors (see below), whose sum is σ = 23268881808. Its totient is φ = 19390734820.

The previous prime is 21329808259. The next prime is 21329808341. The reversal of 21329808313 is 31380892312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21329808313 - 2²¹ = 21327711161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21329808413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969536731 + ... + 969536752.

It is an arithmetic number, because the mean of its divisors is an integer number (5817220452).

Almost surely, 2^21329808313 is an apocalyptic number.

It is an amenable number.

21329808313 is a deficient number, since it is larger than the sum of its proper divisors (1939073495).

21329808313 is a wasteful number, since it uses less digits than its factorization.

21329808313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939073494.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21329808313 in words is "twenty-one billion, three hundred twenty-nine million, eight hundred eight thousand, three hundred thirteen".