1211022211 has 8 divisors (see below), whose sum is σ = 1412271200. Its totient is φ = 1038018744.

The previous prime is 1211022193. The next prime is 1211022229. The reversal of 1211022211 is 1122201121.

It is an interprime number because it is at equal distance from previous prime (1211022193) and next prime (1211022229).

It is not a de Polignac number, because 1211022211 - 2⁵ = 1211022179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211022191 and 1211022200.

It is not an unprimeable number, because it can be changed into a prime (1211022271) 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, 1764996 + ... + 1765681.

It is an arithmetic number, because the mean of its divisors is an integer number (176533900).

Almost surely, 2^1211022211 is an apocalyptic number.

1211022211 is a deficient number, since it is larger than the sum of its proper divisors (201248989).

1211022211 is an frugal number, since it uses more digits than its factorization.

1211022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3530698 (or 3530684 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1211022211 is about 34799.7444099809. The cubic root of 1211022211 is about 1065.9022267756.

Adding to 1211022211 its reverse (1122201121), we get a palindrome (2333223332).

The spelling of 1211022211 in words is "one billion, two hundred eleven million, twenty-two thousand, two hundred eleven".