22221222021020 has 96 divisors (see below), whose sum is σ = 52123250462976. Its totient is φ = 7887591936000.

The previous prime is 22221222021001. The next prime is 22221222021041. The reversal of 22221222021020 is 2012022212222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22221222020983 and 22221222021001.

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, 14411867 + ... + 15879053.

It is an arithmetic number, because the mean of its divisors is an integer number (542950525656).

Almost surely, 2^{22221222021020} is an apocalyptic number.

22221222021020 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 22221222021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26061625231488).

22221222021020 is an abundant number, since it is smaller than the sum of its proper divisors (29902028441956).

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

22221222021020 is a wasteful number, since it uses less digits than its factorization.

22221222021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468851 (or 1468849 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 22221222021020 its reverse (2012022212222), we get a palindrome (24233244233242).

The spelling of 22221222021020 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, twenty".