21103011331 has 8 divisors (see below), whose sum is σ = 22082163584. Its totient is φ = 20142509760.

The previous prime is 21103011311. The next prime is 21103011337. The reversal of 21103011331 is 13311030112.

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 21103011331 - 2⁷ = 21103011203 is a prime.

It is a super-3 number, since 3×21103011331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103011337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4660356 + ... + 4664881.

It is an arithmetic number, because the mean of its divisors is an integer number (2760270448).

Almost surely, 2^21103011331 is an apocalyptic number.

21103011331 is a deficient number, since it is larger than the sum of its proper divisors (979152253).

21103011331 is an equidigital number, since it uses as much as digits as its factorization.

21103011331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325341.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21103011331 its reverse (13311030112), we get a palindrome (34414041443).

The spelling of 21103011331 in words is "twenty-one billion, one hundred three million, eleven thousand, three hundred thirty-one".