21202220222220 has 24 divisors (see below), whose sum is σ = 59366216622384. Its totient is φ = 5653925392576.

The previous prime is 21202220222167. The next prime is 21202220222243. The reversal of 21202220222220 is 2222202220212.

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, 176685168459 + ... + 176685168578.

It is an arithmetic number, because the mean of its divisors is an integer number (2473592359266).

Almost surely, 2^{21202220222220} is an apocalyptic number.

21202220222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202220222220 is an abundant number, since it is smaller than the sum of its proper divisors (38163996400164).

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

21202220222220 is a wasteful number, since it uses less digits than its factorization.

21202220222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353370337049 (or 353370337047 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 21202220222220 its reverse (2222202220212), we get a palindrome (23424422442432).

The spelling of 21202220222220 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty".