21103333020 has 144 divisors (see below), whose sum is σ = 79809020928. Its totient is φ = 4385105280.

The previous prime is 21103333001. The next prime is 21103333033. The reversal of 21103333020 is 2033330112.

21103333020 is a `hidden beast` number, since 21 + 10 + 333 + 302 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21103332984 and 21103333002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 747444 + ... + 775163.

It is an arithmetic number, because the mean of its divisors is an integer number (554229312).

Almost surely, 2^21103333020 is an apocalyptic number.

21103333020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103333020 is an abundant number, since it is smaller than the sum of its proper divisors (58705687908).

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

21103333020 is a wasteful number, since it uses less digits than its factorization.

21103333020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522640 (or 1522635 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21103333020 its reverse (2033330112), we get a palindrome (23136663132).

The spelling of 21103333020 in words is "twenty-one billion, one hundred three million, three hundred thirty-three thousand, twenty".