21110210020 has 24 divisors (see below), whose sum is σ = 46939173624. Its totient is φ = 7947373056.

The previous prime is 21110209999. The next prime is 21110210021. The reversal of 21110210020 is 2001201112.

It can be written as a sum of positive squares in 4 ways, for example, as 1405350144 + 19704859876 = 37488^2 + 140374^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21110209979 and 21110210006.

It is not an unprimeable number, because it can be changed into a prime (21110210021) 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 7 ways as a sum of consecutive naturals, for example, 31044087 + ... + 31044766.

It is an arithmetic number, because the mean of its divisors is an integer number (1955798901).

Almost surely, 2^21110210020 is an apocalyptic number.

21110210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110210020 is an abundant number, since it is smaller than the sum of its proper divisors (25828963604).

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

21110210020 is a wasteful number, since it uses less digits than its factorization.

21110210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62088879 (or 62088877 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21110210020 its reverse (2001201112), we get a palindrome (23111411132).

It can be divided in two parts, 211102 and 10020, that added together give a palindrome (221122).

The spelling of 21110210020 in words is "twenty-one billion, one hundred ten million, two hundred ten thousand, twenty".