21320012233205 has 8 divisors (see below), whose sum is σ = 29238873919872. Its totient is φ = 14619436959888.

The previous prime is 21320012233181. The next prime is 21320012233207. The reversal of 21320012233205 is 50233221002312.

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 21320012233205 - 2⁸ = 21320012232949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320012233207) 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, 304571603297 + ... + 304571603366.

It is an arithmetic number, because the mean of its divisors is an integer number (3654859239984).

Almost surely, 2^{21320012233205} is an apocalyptic number.

It is an amenable number.

21320012233205 is a deficient number, since it is larger than the sum of its proper divisors (7918861686667).

21320012233205 is an equidigital number, since it uses as much as digits as its factorization.

21320012233205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609143206675.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21320012233205 its reverse (50233221002312), we get a palindrome (71553233235517).

The spelling of 21320012233205 in words is "twenty-one trillion, three hundred twenty billion, twelve million, two hundred thirty-three thousand, two hundred five".