21110222020 has 96 divisors (see below), whose sum is σ = 47354969088. Its totient is φ = 7886410752.

The previous prime is 21110221991. The next prime is 21110222027. The reversal of 21110222020 is 2022201112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21110222027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12041464 + ... + 12043216.

It is an arithmetic number, because the mean of its divisors is an integer number (493280928).

Almost surely, 2^21110222020 is an apocalyptic number.

21110222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23677484544).

21110222020 is an abundant number, since it is smaller than the sum of its proper divisors (26244747068).

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

21110222020 is a wasteful number, since it uses less digits than its factorization.

21110222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389 (or 2387 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21110222020 its reverse (2022201112), we get a palindrome (23132423132).

The spelling of 21110222020 in words is "twenty-one billion, one hundred ten million, two hundred twenty-two thousand, twenty".