1266213211 has 4 divisors (see below), whose sum is σ = 1270337992. Its totient is φ = 1262088432.

The previous prime is 1266213203. The next prime is 1266213233. The reversal of 1266213211 is 1123126621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1123126621 = 31 ⋅36229891.

It is a cyclic number.

It is not a de Polignac number, because 1266213211 - 2³ = 1266213203 is a prime.

It is a super-3 number, since 3×1266213211³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266213281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061930 + ... + 2062543.

It is an arithmetic number, because the mean of its divisors is an integer number (317584498).

Almost surely, 2^1266213211 is an apocalyptic number.

1266213211 is a deficient number, since it is larger than the sum of its proper divisors (4124781).

1266213211 is an equidigital number, since it uses as much as digits as its factorization.

1266213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124780.

The product of its digits is 864, while the sum is 25.

The square root of 1266213211 is about 35583.8897677025. The cubic root of 1266213211 is about 1081.8547265049.

Adding to 1266213211 its reverse (1123126621), we get a palindrome (2389339832).

The spelling of 1266213211 in words is "one billion, two hundred sixty-six million, two hundred thirteen thousand, two hundred eleven".