22221012220220 has 48 divisors (see below), whose sum is σ = 50910564676608. Its totient is φ = 8079694148160.

The previous prime is 22221012220217. The next prime is 22221012220343. The reversal of 22221012220220 is 2202221012222.

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 = 22221012220192 and 22221012220201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1564532 + ... + 6847611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060636764096).

Almost surely, 2^{22221012220220} is an apocalyptic number.

22221012220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221012220220 is an abundant number, since it is smaller than the sum of its proper divisors (28689552456388).

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

22221012220220 is a wasteful number, since it uses less digits than its factorization.

22221012220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8424170 (or 8424168 counting only the distinct ones).

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

Adding to 22221012220220 its reverse (2202221012222), we get a palindrome (24423233232442).

The spelling of 22221012220220 in words is "twenty-two trillion, two hundred twenty-one billion, twelve million, two hundred twenty thousand, two hundred twenty".