1211230105 has 4 divisors (see below), whose sum is σ = 1453476132. Its totient is φ = 968984080.

The previous prime is 1211230079. The next prime is 1211230121. The reversal of 1211230105 is 5010321121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5010321121 = 13 ⋅385409317.

It can be written as a sum of positive squares in 2 ways, for example, as 124077321 + 1087152784 = 11139^2 + 32972^2 .

It is not a de Polignac number, because 1211230105 - 2¹⁷ = 1211099033 is a prime.

It is a super-2 number, since 2×1211230105² = 2934156734516622050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121123006 + ... + 121123015.

It is an arithmetic number, because the mean of its divisors is an integer number (363369033).

Almost surely, 2^1211230105 is an apocalyptic number.

It is an amenable number.

1211230105 is a deficient number, since it is larger than the sum of its proper divisors (242246027).

1211230105 is an equidigital number, since it uses as much as digits as its factorization.

1211230105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242246026.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1211230105 is about 34802.7312864953. The cubic root of 1211230105 is about 1065.9632171236.

Adding to 1211230105 its reverse (5010321121), we get a palindrome (6221551226).

The spelling of 1211230105 in words is "one billion, two hundred eleven million, two hundred thirty thousand, one hundred five".