21113268991 has 8 divisors (see below), whose sum is σ = 22044985344. Its totient is φ = 20182698360.

The previous prime is 21113268989. The next prime is 21113269007. The reversal of 21113268991 is 19986231112.

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 21113268991 - 2¹ = 21113268989 is a prime.

It is a super-3 number, since 3×21113268991³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113268931) 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 7 ways as a sum of consecutive naturals, for example, 248655 + ... + 322576.

It is an arithmetic number, because the mean of its divisors is an integer number (2755623168).

Almost surely, 2^21113268991 is an apocalyptic number.

21113268991 is a deficient number, since it is larger than the sum of its proper divisors (931716353).

21113268991 is a wasteful number, since it uses less digits than its factorization.

21113268991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572861.

The product of its digits is 46656, while the sum is 43.

The spelling of 21113268991 in words is "twenty-one billion, one hundred thirteen million, two hundred sixty-eight thousand, nine hundred ninety-one".