1211442105 has 8 divisors (see below), whose sum is σ = 1938307392. Its totient is φ = 646102448.

The previous prime is 1211442097. The next prime is 1211442161. The reversal of 1211442105 is 5012441121.

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 1211442105 - 2³ = 1211442097 is a prime.

It is a super-3 number, since 3×1211442105³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40381389 + ... + 40381418.

It is an arithmetic number, because the mean of its divisors is an integer number (242288424).

Almost surely, 2^1211442105 is an apocalyptic number.

1211442105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211442105 is a deficient number, since it is larger than the sum of its proper divisors (726865287).

1211442105 is an equidigital number, since it uses as much as digits as its factorization.

1211442105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80762815.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1211442105 is about 34805.7768912001. The cubic root of 1211442105 is about 1066.0254048719.

Adding to 1211442105 its reverse (5012441121), we get a palindrome (6223883226).

The spelling of 1211442105 in words is "one billion, two hundred eleven million, four hundred forty-two thousand, one hundred five".