21101330331 has 10 divisors (see below), whose sum is σ = 31521740492. Its totient is φ = 14067553500.

The previous prime is 21101330329. The next prime is 21101330347. The reversal of 21101330331 is 13303310112.

It is a happy number.

21101330331 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 1 + 330 + 331 = 666.

It is not a de Polignac number, because 21101330331 - 2¹ = 21101330329 is a prime.

It is a super-2 number, since 2×21101330331² (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 (21101330321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130255045 + ... + 130255206.

Almost surely, 2^21101330331 is an apocalyptic number.

21101330331 is a deficient number, since it is larger than the sum of its proper divisors (10420410161).

21101330331 is an equidigital number, since it uses as much as digits as its factorization.

21101330331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260510263 (or 260510254 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21101330331 its reverse (13303310112), we get a palindrome (34404640443).

The spelling of 21101330331 in words is "twenty-one billion, one hundred one million, three hundred thirty thousand, three hundred thirty-one".