1220266111 has 4 divisors (see below), whose sum is σ = 1232846272. Its totient is φ = 1207685952.

The previous prime is 1220266087. The next prime is 1220266129. The reversal of 1220266111 is 1116620221.

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 1220266111 - 2⁵ = 1220266079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220266141) 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, 6289935 + ... + 6290128.

It is an arithmetic number, because the mean of its divisors is an integer number (308211568).

Almost surely, 2^1220266111 is an apocalyptic number.

1220266111 is a deficient number, since it is larger than the sum of its proper divisors (12580161).

1220266111 is an equidigital number, since it uses as much as digits as its factorization.

1220266111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580160.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1220266111 is about 34932.3075533238. The cubic root of 1220266111 is about 1068.6074150787.

Adding to 1220266111 its reverse (1116620221), we get a palindrome (2336886332).

The spelling of 1220266111 in words is "one billion, two hundred twenty million, two hundred sixty-six thousand, one hundred eleven".