1211230111 has 8 divisors (see below), whose sum is σ = 1490744864. Its totient is φ = 958335840.

The previous prime is 1211230079. The next prime is 1211230121. The reversal of 1211230111 is 1110321121.

It is a happy number.

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

It is not a de Polignac number, because 1211230111 - 2⁵ = 1211230079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1211230091 and 1211230100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211230121) 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 7 ways as a sum of consecutive naturals, for example, 6655020 + ... + 6655201.

It is an arithmetic number, because the mean of its divisors is an integer number (186343108).

Almost surely, 2^1211230111 is an apocalyptic number.

1211230111 is a deficient number, since it is larger than the sum of its proper divisors (279514753).

1211230111 is a wasteful number, since it uses less digits than its factorization.

1211230111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13310241.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211230111 is about 34802.7313726954. The cubic root of 1211230111 is about 1065.9632188838.

Adding to 1211230111 its reverse (1110321121), we get a palindrome (2321551232).

The spelling of 1211230111 in words is "one billion, two hundred eleven million, two hundred thirty thousand, one hundred eleven".