21023021103 has 24 divisors (see below), whose sum is σ = 32923732608. Its totient is φ = 11896513776.

The previous prime is 21023021017. The next prime is 21023021137. The reversal of 21023021103 is 30112032012.

It is not a de Polignac number, because 21023021103 - 2²⁴ = 21006243887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023021153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 679101 + ... + 709382.

It is an arithmetic number, because the mean of its divisors is an integer number (1371822192).

Almost surely, 2^21023021103 is an apocalyptic number.

21023021103 is a deficient number, since it is larger than the sum of its proper divisors (11900711505).

21023021103 is a wasteful number, since it uses less digits than its factorization.

21023021103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388603 (or 1388596 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21023021103 its reverse (30112032012), we get a palindrome (51135053115).

The spelling of 21023021103 in words is "twenty-one billion, twenty-three million, twenty-one thousand, one hundred three".