21101200011103 has 4 divisors (see below), whose sum is σ = 21101213421568. Its totient is φ = 21101186600640.

The previous prime is 21101200011097. The next prime is 21101200011107. The reversal of 21101200011103 is 30111000210112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21101200011103 - 2¹⁷ = 21101199880031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101200011107) 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, 3974226 + ... + 7615567.

It is an arithmetic number, because the mean of its divisors is an integer number (5275303355392).

Almost surely, 2^{21101200011103} is an apocalyptic number.

21101200011103 is a deficient number, since it is larger than the sum of its proper divisors (13410465).

21101200011103 is a wasteful number, since it uses less digits than its factorization.

21101200011103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13410464.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21101200011103 its reverse (30111000210112), we get a palindrome (51212200221215).

The spelling of 21101200011103 in words is "twenty-one trillion, one hundred one billion, two hundred million, eleven thousand, one hundred three".