101212120209 has 4 divisors (see below), whose sum is σ = 134949493616. Its totient is φ = 67474746804.

The previous prime is 101212120169. The next prime is 101212120213. The reversal of 101212120209 is 902021212101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 101212120209 - 2²⁷ = 101077902481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (101212120279) 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 3 ways as a sum of consecutive naturals, for example, 16868686699 + ... + 16868686704.

It is an arithmetic number, because the mean of its divisors is an integer number (33737373404).

Almost surely, 2^101212120209 is an apocalyptic number.

It is an amenable number.

101212120209 is a deficient number, since it is larger than the sum of its proper divisors (33737373407).

101212120209 is an equidigital number, since it uses as much as digits as its factorization.

101212120209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33737373406.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 101212120209 in words is "one hundred one billion, two hundred twelve million, one hundred twenty thousand, two hundred nine".