1212105205 has 8 divisors (see below), whose sum is σ = 1463236992. Its totient is φ = 963877008.

The previous prime is 1212105203. The next prime is 1212105211. The reversal of 1212105205 is 5025012121.

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 1212105205 - 2¹ = 1212105203 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 (1212105203) 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, 724977 + ... + 726646.

It is an arithmetic number, because the mean of its divisors is an integer number (182904624).

Almost surely, 2^1212105205 is an apocalyptic number.

It is an amenable number.

1212105205 is a deficient number, since it is larger than the sum of its proper divisors (251131787).

1212105205 is a wasteful number, since it uses less digits than its factorization.

1212105205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451795.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1212105205 is about 34815.3013056041. The cubic root of 1212105205 is about 1066.2198707647.

Adding to 1212105205 its reverse (5025012121), we get a palindrome (6237117326).

The spelling of 1212105205 in words is "one billion, two hundred twelve million, one hundred five thousand, two hundred five".