1211022220 has 24 divisors (see below), whose sum is σ = 2653719264. Its totient is φ = 463347456.

The previous prime is 1211022193. The next prime is 1211022229. The reversal of 1211022220 is 222201121.

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 1211022220.

It is not an unprimeable number, because it can be changed into a prime (1211022229) 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, 1315869 + ... + 1316788.

It is an arithmetic number, because the mean of its divisors is an integer number (110571636).

Almost surely, 2^1211022220 is an apocalyptic number.

1211022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211022220 is an abundant number, since it is smaller than the sum of its proper divisors (1442697044).

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

1211022220 is a wasteful number, since it uses less digits than its factorization.

1211022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632689 (or 2632687 counting only the distinct ones).

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

The square root of 1211022220 is about 34799.7445392922. The cubic root of 1211022220 is about 1065.9022294161.

Adding to 1211022220 its reverse (222201121), we get a palindrome (1433223341).

The spelling of 1211022220 in words is "one billion, two hundred eleven million, twenty-two thousand, two hundred twenty".