1021120220220 has 24 divisors (see below), whose sum is σ = 2859136616784. Its totient is φ = 272298725376.

The previous prime is 1021120220207. The next prime is 1021120220221. The reversal of 1021120220220 is 220220211201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021120220220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120220221) 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, 8509335109 + ... + 8509335228.

It is an arithmetic number, because the mean of its divisors is an integer number (119130692366).

Almost surely, 2^{1021120220220} is an apocalyptic number.

1021120220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021120220220 is an abundant number, since it is smaller than the sum of its proper divisors (1838016396564).

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

1021120220220 is a wasteful number, since it uses less digits than its factorization.

1021120220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17018670349 (or 17018670347 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1021120220220 its reverse (220220211201), we get a palindrome (1241340431421).

The spelling of 1021120220220 in words is "one trillion, twenty-one billion, one hundred twenty million, two hundred twenty thousand, two hundred twenty".