21133321103 has 4 divisors (see below), whose sum is σ = 21342562008. Its totient is φ = 20924080200.

The previous prime is 21133321051. The next prime is 21133321123. The reversal of 21133321103 is 30112333112.

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 21133321103 - 2¹⁴ = 21133304719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133321123) 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, 104620301 + ... + 104620502.

It is an arithmetic number, because the mean of its divisors is an integer number (5335640502).

Almost surely, 2^21133321103 is an apocalyptic number.

21133321103 is a deficient number, since it is larger than the sum of its proper divisors (209240905).

21133321103 is a wasteful number, since it uses less digits than its factorization.

21133321103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209240904.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21133321103 its reverse (30112333112), we get a palindrome (51245654215).

The spelling of 21133321103 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, one hundred three".