21100113321113 has 4 divisors (see below), whose sum is σ = 21100423170228. Its totient is φ = 21099803472000.

The previous prime is 21100113321107. The next prime is 21100113321127. The reversal of 21100113321113 is 31112331100112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1584950066704 + 19515163254409 = 1258948^2 + 4417597^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100113321113 - 2⁴ = 21100113321097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100113321613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154822388 + ... + 154958613.

It is an arithmetic number, because the mean of its divisors is an integer number (5275105792557).

Almost surely, 2^{21100113321113} is an apocalyptic number.

It is an amenable number.

21100113321113 is a deficient number, since it is larger than the sum of its proper divisors (309849115).

21100113321113 is an equidigital number, since it uses as much as digits as its factorization.

21100113321113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309849114.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21100113321113 its reverse (31112331100112), we get a palindrome (52212444421225).

The spelling of 21100113321113 in words is "twenty-one trillion, one hundred billion, one hundred thirteen million, three hundred twenty-one thousand, one hundred thirteen".