21023110220 has 96 divisors (see below), whose sum is σ = 51685218816. Its totient is φ = 7032614400.

The previous prime is 21023110127. The next prime is 21023110243. The reversal of 21023110220 is 2201132012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21023110195 and 21023110204.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9215480 + ... + 9217760.

It is an arithmetic number, because the mean of its divisors is an integer number (538387696).

Almost surely, 2^21023110220 is an apocalyptic number.

21023110220 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 21023110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25842609408).

21023110220 is an abundant number, since it is smaller than the sum of its proper divisors (30662108596).

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

21023110220 is a wasteful number, since it uses less digits than its factorization.

21023110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871 (or 3869 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21023110220 its reverse (2201132012), we get a palindrome (23224242232).

The spelling of 21023110220 in words is "twenty-one billion, twenty-three million, one hundred ten thousand, two hundred twenty".