202012221220 has 24 divisors (see below), whose sum is σ = 426569460408. Its totient is φ = 80358451200.

The previous prime is 202012221209. The next prime is 202012221221. The reversal of 202012221220 is 22122210202.

It can be written as a sum of positive squares in 4 ways, for example, as 20227666176 + 181784555044 = 142224^2 + 426362^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202012221194 and 202012221203.

It is not an unprimeable number, because it can be changed into a prime (202012221221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27898621 + ... + 27905860.

It is an arithmetic number, because the mean of its divisors is an integer number (17773727517).

Almost surely, 2^202012221220 is an apocalyptic number.

202012221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202012221220 is an abundant number, since it is smaller than the sum of its proper divisors (224557239188).

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

202012221220 is a wasteful number, since it uses less digits than its factorization.

202012221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55804671 (or 55804669 counting only the distinct ones).

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

Adding to 202012221220 its reverse (22122210202), we get a palindrome (224134431422).

The spelling of 202012221220 in words is "two hundred two billion, twelve million, two hundred twenty-one thousand, two hundred twenty".