2221211266 has 4 divisors (see below), whose sum is σ = 3331816902. Its totient is φ = 1110605632.

The previous prime is 2221211261. The next prime is 2221211273. The reversal of 2221211266 is 6621121222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6621121222 = 2 ⋅3310560611.

It can be written as a sum of positive squares in only one way, i.e., 2173890625 + 47320641 = 46625^2 + 6879^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2221211266.

It is not an unprimeable number, because it can be changed into a prime (2221211261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555302815 + ... + 555302818.

Almost surely, 2^2221211266 is an apocalyptic number.

2221211266 is a deficient number, since it is larger than the sum of its proper divisors (1110605636).

2221211266 is a wasteful number, since it uses less digits than its factorization.

2221211266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110605635.

The product of its digits is 1152, while the sum is 25.

The square root of 2221211266 is about 47129.7280492897. The cubic root of 2221211266 is about 1304.7579623836.

Adding to 2221211266 its reverse (6621121222), we get a palindrome (8842332488).

The spelling of 2221211266 in words is "two billion, two hundred twenty-one million, two hundred eleven thousand, two hundred sixty-six".