21101103020 has 24 divisors (see below), whose sum is σ = 44541921984. Its totient is φ = 8396706816.

The previous prime is 21101102987. The next prime is 21101103029. The reversal of 21101103020 is 2030110112.

It is a junction number, because it is equal to n+sod(n) for n = 21101102992 and 21101103010.

It is not an unprimeable number, because it can be changed into a prime (21101103029) 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 7 ways as a sum of consecutive naturals, for example, 2729444 + ... + 2737163.

It is an arithmetic number, because the mean of its divisors is an integer number (1855913416).

Almost surely, 2^21101103020 is an apocalyptic number.

21101103020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101103020 is an abundant number, since it is smaller than the sum of its proper divisors (23440818964).

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

21101103020 is a wasteful number, since it uses less digits than its factorization.

21101103020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5466809 (or 5466807 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21101103020 its reverse (2030110112), we get a palindrome (23131213132).

The spelling of 21101103020 in words is "twenty-one billion, one hundred one million, one hundred three thousand, twenty".