22221000012020 has 96 divisors (see below), whose sum is σ = 47850478220160. Its totient is φ = 8663310028800.

The previous prime is 22221000012019. The next prime is 22221000012049. The reversal of 22221000012020 is 2021000012222.

It is a junction number, because it is equal to n+sod(n) for n = 22221000011986 and 22221000012004.

It is a congruent number.

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, 1882970120 + ... + 1882981920.

It is an arithmetic number, because the mean of its divisors is an integer number (498442481460).

Almost surely, 2^{22221000012020} is an apocalyptic number.

22221000012020 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 22221000012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23925239110080).

22221000012020 is an abundant number, since it is smaller than the sum of its proper divisors (25629478208140).

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

22221000012020 is a wasteful number, since it uses less digits than its factorization.

22221000012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16305 (or 16303 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22221000012020 its reverse (2021000012222), we get a palindrome (24242000024242).

The spelling of 22221000012020 in words is "twenty-two trillion, two hundred twenty-one billion, twelve thousand, twenty".