1021202221220 has 24 divisors (see below), whose sum is σ = 2179680809208. Its totient is φ = 401784480000.

The previous prime is 1021202221217. The next prime is 1021202221253. The reversal of 1021202221220 is 221222021201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3125257216 + 1018076964004 = 55904^2 + 1008998^2 .

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, 418524281 + ... + 418526720.

It is an arithmetic number, because the mean of its divisors is an integer number (90820033717).

Almost surely, 2^{1021202221220} is an apocalyptic number.

1021202221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021202221220 is an abundant number, since it is smaller than the sum of its proper divisors (1158478587988).

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

1021202221220 is a wasteful number, since it uses less digits than its factorization.

1021202221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837051071 (or 837051069 counting only the distinct ones).

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

Adding to 1021202221220 its reverse (221222021201), we get a palindrome (1242424242421).

The spelling of 1021202221220 in words is "one trillion, twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty".