1021222201220 has 96 divisors (see below), whose sum is σ = 2318237947872. Its totient is φ = 375647551488.

The previous prime is 1021222201193. The next prime is 1021222201249. The reversal of 1021222201220 is 221022221201.

It is a happy number.

1021222201220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 952560384064 + 68661817156 = 975992^2 + 262034^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111324554 + ... + 111333726.

It is an arithmetic number, because the mean of its divisors is an integer number (24148311957).

Almost surely, 2^{1021222201220} is an apocalyptic number.

1021222201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021222201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159118973936).

1021222201220 is an abundant number, since it is smaller than the sum of its proper divisors (1297015746652).

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

1021222201220 is a wasteful number, since it uses less digits than its factorization.

1021222201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10761 (or 10759 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1021222201220 its reverse (221022221201), we get a palindrome (1242244422421).

The spelling of 1021222201220 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty".