1211002220 has 48 divisors (see below), whose sum is σ = 2595841248. Its totient is φ = 474439680.

The previous prime is 1211002181. The next prime is 1211002291. The reversal of 1211002220 is 222001121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240044 + ... + 245036.

It is an arithmetic number, because the mean of its divisors is an integer number (54080026).

Almost surely, 2^1211002220 is an apocalyptic number.

1211002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211002220 is an abundant number, since it is smaller than the sum of its proper divisors (1384839028).

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

1211002220 is a wasteful number, since it uses less digits than its factorization.

1211002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250 (or 5248 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1211002220 is about 34799.4571796745. The cubic root of 1211002220 is about 1065.8963616014.

Adding to 1211002220 its reverse (222001121), we get a palindrome (1433003341).

The spelling of 1211002220 in words is "one billion, two hundred eleven million, two thousand, two hundred twenty".