21321320113 has 8 divisors (see below), whose sum is σ = 21685181760. Its totient is φ = 20957541360.

The previous prime is 21321320107. The next prime is 21321320129. The reversal of 21321320113 is 31102312312.

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 21321320113 - 2⁵ = 21321320081 is a prime.

It is a super-2 number, since 2×21321320113² (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 (21321320143) 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 7 ways as a sum of consecutive naturals, for example, 724068 + ... + 752938.

It is an arithmetic number, because the mean of its divisors is an integer number (2710647720).

Almost surely, 2^21321320113 is an apocalyptic number.

It is an amenable number.

21321320113 is a deficient number, since it is larger than the sum of its proper divisors (363861647).

21321320113 is a wasteful number, since it uses less digits than its factorization.

21321320113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41447.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21321320113 its reverse (31102312312), we get a palindrome (52423632425).

The spelling of 21321320113 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty thousand, one hundred thirteen".