22221020 has 24 divisors (see below), whose sum is σ = 46950624. Its totient is φ = 8833856.

The previous prime is 22221007. The next prime is 22221029. The reversal of 22221020 is 2012222.

It is a junction number, because it is equal to n+sod(n) for n = 22220992 and 22221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14 + ... + 6666.

It is an arithmetic number, because the mean of its divisors is an integer number (1956276).

Almost surely, 2^22221020 is an apocalyptic number.

22221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221020 is an abundant number, since it is smaller than the sum of its proper divisors (24729604).

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

22221020 is a wasteful number, since it uses less digits than its factorization.

22221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6829 (or 6827 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22221020 is about 4713.9176912628. The cubic root of 22221020 is about 281.1391517084.

Adding to 22221020 its reverse (2012222), we get a palindrome (24233242).

The spelling of 22221020 in words is "twenty-two million, two hundred twenty-one thousand, twenty".