21112120012103 has 4 divisors (see below), whose sum is σ = 21112311426480. Its totient is φ = 21111928597728.

The previous prime is 21112120012099. The next prime is 21112120012147. The reversal of 21112120012103 is 30121002121112.

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 21112120012103 - 2² = 21112120012099 is a prime.

It is a super-2 number, since 2×21112120012103² (a number of 27 digits) contains 22 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 (21112120012603) 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, 95541650 + ... + 95762367.

It is an arithmetic number, because the mean of its divisors is an integer number (5278077856620).

Almost surely, 2^{21112120012103} is an apocalyptic number.

21112120012103 is a deficient number, since it is larger than the sum of its proper divisors (191414377).

21112120012103 is a wasteful number, since it uses less digits than its factorization.

21112120012103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191414376.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21112120012103 its reverse (30121002121112), we get a palindrome (51233122133215).

The spelling of 21112120012103 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty million, twelve thousand, one hundred three".