21111033203 has 16 divisors (see below), whose sum is σ = 22799280000. Its totient is φ = 19432068480.

The previous prime is 21111033191. The next prime is 21111033233. The reversal of 21111033203 is 30233011112.

It is a cyclic number.

It is not a de Polignac number, because 21111033203 - 2³⁴ = 3931164019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111033233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10559798 + ... + 10561796.

It is an arithmetic number, because the mean of its divisors is an integer number (1424955000).

Almost surely, 2^21111033203 is an apocalyptic number.

21111033203 is a deficient number, since it is larger than the sum of its proper divisors (1688246797).

21111033203 is a wasteful number, since it uses less digits than its factorization.

21111033203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21111033203 its reverse (30233011112), we get a palindrome (51344044315).

The spelling of 21111033203 in words is "twenty-one billion, one hundred eleven million, thirty-three thousand, two hundred three".