21311021113 has 8 divisors (see below), whose sum is σ = 22083078600. Its totient is φ = 20541443328.

The previous prime is 21311021111. The next prime is 21311021141. The reversal of 21311021113 is 31112011312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3304870144 + 18006150969 = 57488^2 + 134187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21311021113 - 2¹ = 21311021111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311021111) 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, 602418 + ... + 636811.

It is an arithmetic number, because the mean of its divisors is an integer number (2760384825).

Almost surely, 2^21311021113 is an apocalyptic number.

It is an amenable number.

21311021113 is a deficient number, since it is larger than the sum of its proper divisors (772057487).

21311021113 is a wasteful number, since it uses less digits than its factorization.

21311021113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239851.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21311021113 its reverse (31112011312), we get a palindrome (52423032425).

The spelling of 21311021113 in words is "twenty-one billion, three hundred eleven million, twenty-one thousand, one hundred thirteen".