21100320331 has 8 divisors (see below), whose sum is σ = 21216298320. Its totient is φ = 20984544768.

The previous prime is 21100320281. The next prime is 21100320343. The reversal of 21100320331 is 13302300112.

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 21100320331 - 2⁹ = 21100319819 is a prime.

It is a super-2 number, since 2×21100320331² (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 (21100321331) 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, 160855 + ... + 260911.

It is an arithmetic number, because the mean of its divisors is an integer number (2652037290).

Almost surely, 2^21100320331 is an apocalyptic number.

21100320331 is a deficient number, since it is larger than the sum of its proper divisors (115977989).

21100320331 is a wasteful number, since it uses less digits than its factorization.

21100320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101213.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21100320331 its reverse (13302300112), we get a palindrome (34402620443).

The spelling of 21100320331 in words is "twenty-one billion, one hundred million, three hundred twenty thousand, three hundred thirty-one".