1221223111 has 8 divisors (see below), whose sum is σ = 1295211744. Its totient is φ = 1148975520.

The previous prime is 1221223103. The next prime is 1221223117. The reversal of 1221223111 is 1113221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221223111 - 2³ = 1221223103 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 (1221223117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433816 + ... + 436621.

It is an arithmetic number, because the mean of its divisors is an integer number (161901468).

Almost surely, 2^1221223111 is an apocalyptic number.

1221223111 is a deficient number, since it is larger than the sum of its proper divisors (73988633).

1221223111 is an equidigital number, since it uses as much as digits as its factorization.

1221223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870521.

The product of its digits is 48, while the sum is 16.

The square root of 1221223111 is about 34946.0027900188. The cubic root of 1221223111 is about 1068.8866957105.

Adding to 1221223111 its reverse (1113221221), we get a palindrome (2334444332).

The spelling of 1221223111 in words is "one billion, two hundred twenty-one million, two hundred twenty-three thousand, one hundred eleven".