21110020022220 has 288 divisors, whose sum is σ = 66141408990720. Its totient is φ = 5015766343680.

The previous prime is 21110020022219. The next prime is 21110020022233. The reversal of 21110020022220 is 2222002001112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21110020022220.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 476706480 + ... + 476750760.

Almost surely, 2^{21110020022220} is an apocalyptic number.

21110020022220 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 21110020022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33070704495360).

21110020022220 is an abundant number, since it is smaller than the sum of its proper divisors (45031388968500).

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

21110020022220 is a wasteful number, since it uses less digits than its factorization.

21110020022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45793 (or 45774 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21110020022220 its reverse (2222002001112), we get a palindrome (23332022023332).

The spelling of 21110020022220 in words is "twenty-one trillion, one hundred ten billion, twenty million, twenty-two thousand, two hundred twenty".