21120021112003 has 24 divisors (see below), whose sum is σ = 25264559361024. Its totient is φ = 17487683433600.

The previous prime is 21120021111997. The next prime is 21120021112009. The reversal of 21120021112003 is 30021112002112.

It is an interprime number because it is at equal distance from previous prime (21120021111997) and next prime (21120021112009).

It is a de Polignac number, because none of the positive numbers 2^k-21120021112003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120021112009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107056375 + ... + 107253472.

It is an arithmetic number, because the mean of its divisors is an integer number (1052689973376).

Almost surely, 2^{21120021112003} is an apocalyptic number.

21120021112003 is a deficient number, since it is larger than the sum of its proper divisors (4144538249021).

21120021112003 is a wasteful number, since it uses less digits than its factorization.

21120021112003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214309923 (or 214309906 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120021112003 its reverse (30021112002112), we get a palindrome (51141133114115).

The spelling of 21120021112003 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred twelve thousand, three".