1211201212009 has 8 divisors (see below), whose sum is σ = 1316076020480. Its totient is φ = 1110439141200.

The previous prime is 1211201211977. The next prime is 1211201212063. The reversal of 1211201212009 is 9002121021121.

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 1211201212009 - 2⁵ = 1211201211977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211201212069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028183802 + ... + 1028184979.

It is an arithmetic number, because the mean of its divisors is an integer number (164509502560).

Almost surely, 2^{1211201212009} is an apocalyptic number.

1211201212009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1211201212009 is a deficient number, since it is larger than the sum of its proper divisors (104874808471).

1211201212009 is a wasteful number, since it uses less digits than its factorization.

1211201212009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056368831.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1211201212009 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred twelve thousand, nine".