1211252211 has 24 divisors (see below), whose sum is σ = 1953959280. Its totient is φ = 745384032.

The previous prime is 1211252191. The next prime is 1211252221. The reversal of 1211252211 is 1122521121.

1211252211 is a `hidden beast` number, since 121 + 12 + 522 + 11 = 666.

It is not a de Polignac number, because 1211252211 - 2⁷ = 1211252083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211252221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188556 + ... + 194873.

It is an arithmetic number, because the mean of its divisors is an integer number (81414970).

Almost surely, 2^1211252211 is an apocalyptic number.

1211252211 is a deficient number, since it is larger than the sum of its proper divisors (742707069).

1211252211 is an equidigital number, since it uses as much as digits as its factorization.

1211252211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383457 (or 383445 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 1211252211 is about 34803.0488750627. The cubic root of 1211252211 is about 1065.9697020019.

Adding to 1211252211 its reverse (1122521121), we get a palindrome (2333773332).

The spelling of 1211252211 in words is "one billion, two hundred eleven million, two hundred fifty-two thousand, two hundred eleven".