21112123331003 has 4 divisors (see below), whose sum is σ = 21129190529760. Its totient is φ = 21095056132248.

The previous prime is 21112123330957. The next prime is 21112123331023. The reversal of 21112123331003 is 30013332121112.

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 21112123331003 - 2²² = 21112119136699 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 21112123331003.

It is not an unprimeable number, because it can be changed into a prime (21112123331023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8533597523 + ... + 8533599996.

It is an arithmetic number, because the mean of its divisors is an integer number (5282297632440).

Almost surely, 2^{21112123331003} is an apocalyptic number.

21112123331003 is a deficient number, since it is larger than the sum of its proper divisors (17067198757).

21112123331003 is a wasteful number, since it uses less digits than its factorization.

21112123331003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17067198756.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21112123331003 its reverse (30013332121112), we get a palindrome (51125455452115).

The spelling of 21112123331003 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-three million, three hundred thirty-one thousand, three".