1020221220 has 24 divisors (see below), whose sum is σ = 2856619584. Its totient is φ = 272058976.

The previous prime is 1020221179. The next prime is 1020221231. The reversal of 1020221220 is 221220201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1020221196 and 1020221205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8501784 + ... + 8501903.

It is an arithmetic number, because the mean of its divisors is an integer number (119025816).

Almost surely, 2^1020221220 is an apocalyptic number.

1020221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020221220 is an abundant number, since it is smaller than the sum of its proper divisors (1836398364).

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

1020221220 is a wasteful number, since it uses less digits than its factorization.

1020221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17003699 (or 17003697 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1020221220 is about 31940.9019910209. The cubic root of 1020221220 is about 1006.6954772003.

Adding to 1020221220 its reverse (221220201), we get a palindrome (1241441421).

The spelling of 1020221220 in words is "one billion, twenty million, two hundred twenty-one thousand, two hundred twenty".