21133012103 has 32 divisors (see below), whose sum is σ = 25780737024. Its totient is φ = 16910249472.

The previous prime is 21133012091. The next prime is 21133012123. The reversal of 21133012103 is 30121033112.

It is a cyclic number.

It is not a de Polignac number, because 21133012103 - 2¹⁸ = 21132749959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133012123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15458726 + ... + 15460092.

It is an arithmetic number, because the mean of its divisors is an integer number (805648032).

Almost surely, 2^21133012103 is an apocalyptic number.

21133012103 is a deficient number, since it is larger than the sum of its proper divisors (4647724921).

21133012103 is a wasteful number, since it uses less digits than its factorization.

21133012103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351.

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

Adding to 21133012103 its reverse (30121033112), we get a palindrome (51254045215).

The spelling of 21133012103 in words is "twenty-one billion, one hundred thirty-three million, twelve thousand, one hundred three".