22121202220 has 24 divisors (see below), whose sum is σ = 50027950224. Its totient is φ = 8167828416.

The previous prime is 22121202217. The next prime is 22121202241. The reversal of 22121202220 is 2220212122.

It is a junction number, because it is equal to n+sod(n) for n = 22121202194 and 22121202203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42540514 + ... + 42541033.

It is an arithmetic number, because the mean of its divisors is an integer number (2084497926).

Almost surely, 2^22121202220 is an apocalyptic number.

22121202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121202220 is an abundant number, since it is smaller than the sum of its proper divisors (27906748004).

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

22121202220 is a wasteful number, since it uses less digits than its factorization.

22121202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85081569 (or 85081567 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22121202220 its reverse (2220212122), we get a palindrome (24341414342).

The spelling of 22121202220 in words is "twenty-two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty".