1211002211 has 4 divisors (see below), whose sum is σ = 1211817000. Its totient is φ = 1210187424.

The previous prime is 1211002181. The next prime is 1211002291. The reversal of 1211002211 is 1122001121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211002211 - 2¹⁴ = 1210985827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211002192 and 1211002201.

It is not an unprimeable number, because it can be changed into a prime (1211002291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405161 + ... + 408138.

It is an arithmetic number, because the mean of its divisors is an integer number (302954250).

Almost surely, 2^1211002211 is an apocalyptic number.

1211002211 is a deficient number, since it is larger than the sum of its proper divisors (814789).

1211002211 is an equidigital number, since it uses as much as digits as its factorization.

1211002211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814788.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1211002211 is about 34799.4570503622. The cubic root of 1211002211 is about 1065.8963589608.

Adding to 1211002211 its reverse (1122001121), we get a palindrome (2333003332).

The spelling of 1211002211 in words is "one billion, two hundred eleven million, two thousand, two hundred eleven".