21101113 has 4 divisors (see below), whose sum is σ = 23019408. Its totient is φ = 19182820.

The previous prime is 21101033. The next prime is 21101123. The reversal of 21101113 is 31110112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101113 - 2⁹ = 21100601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101113.

It is not an unprimeable number, because it can be changed into a prime (21101123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959131 + ... + 959152.

It is an arithmetic number, because the mean of its divisors is an integer number (5754852).

Almost surely, 2^21101113 is an apocalyptic number.

It is an amenable number.

21101113 is a deficient number, since it is larger than the sum of its proper divisors (1918295).

21101113 is a wasteful number, since it uses less digits than its factorization.

21101113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918294.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 21101113 is about 4593.5947796905. The cubic root of 21101113 is about 276.3345074272.

Adding to 21101113 its reverse (31110112), we get a palindrome (52211225).

It can be divided in two parts, 2110 and 1113, that added together give a palindrome (3223).

The spelling of 21101113 in words is "twenty-one million, one hundred one thousand, one hundred thirteen".