1021200210220 has 72 divisors (see below), whose sum is σ = 2251872556416. Its totient is φ = 388967073792.

The previous prime is 1021200210193. The next prime is 1021200210301. The reversal of 1021200210220 is 220120021201.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021200210220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2142924 + ... + 2575756.

It is an arithmetic number, because the mean of its divisors is an integer number (31276007728).

Almost surely, 2^{1021200210220} is an apocalyptic number.

1021200210220 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 1021200210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1125936278208).

1021200210220 is an abundant number, since it is smaller than the sum of its proper divisors (1230672346196).

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

1021200210220 is a wasteful number, since it uses less digits than its factorization.

1021200210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433111 (or 433086 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1021200210220 its reverse (220120021201), we get a palindrome (1241320231421).

The spelling of 1021200210220 in words is "one trillion, twenty-one billion, two hundred million, two hundred ten thousand, two hundred twenty".