1220233111 has 2 divisors, whose sum is σ = 1220233112. Its totient is φ = 1220233110.

The previous prime is 1220233109. The next prime is 1220233121. The reversal of 1220233111 is 1113320221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220233111 - 2¹ = 1220233109 is a prime.

Together with 1220233109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220233121) 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 as a sum of consecutive naturals, namely, 610116555 + 610116556.

It is an arithmetic number, because the mean of its divisors is an integer number (610116556).

Almost surely, 2^1220233111 is an apocalyptic number.

1220233111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220233111 is an equidigital number, since it uses as much as digits as its factorization.

1220233111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220233111 is about 34931.8352080162. The cubic root of 1220233111 is about 1068.5977821081.

Adding to 1220233111 its reverse (1113320221), we get a palindrome (2333553332).

The spelling of 1220233111 in words is "one billion, two hundred twenty million, two hundred thirty-three thousand, one hundred eleven".