21103003100 has 36 divisors (see below), whose sum is σ = 45811130400. Its totient is φ = 8437954560.

The previous prime is 21103003093. The next prime is 21103003109. The reversal of 21103003100 is 130030112.

It is a super-2 number, since 2×21103003100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103003109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229661 + ... + 308139.

It is an arithmetic number, because the mean of its divisors is an integer number (1272531400).

Almost surely, 2^21103003100 is an apocalyptic number.

21103003100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103003100 is an abundant number, since it is smaller than the sum of its proper divisors (24708127300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103003100 is a wasteful number, since it uses less digits than its factorization.

21103003100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81182 (or 81175 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21103003100 its reverse (130030112), we get a palindrome (21233033212).

The spelling of 21103003100 in words is "twenty-one billion, one hundred three million, three thousand, one hundred".