1212112109 has 12 divisors (see below), whose sum is σ = 1321992000. Its totient is φ = 1110801744.

The previous prime is 1212112091. The next prime is 1212112129. The reversal of 1212112109 is 9012112121.

It is not a de Polignac number, because 1212112109 - 2²⁰ = 1211063533 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 (1212112129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2309 + ... + 49290.

It is an arithmetic number, because the mean of its divisors is an integer number (110166000).

Almost surely, 2^1212112109 is an apocalyptic number.

It is an amenable number.

1212112109 is a deficient number, since it is larger than the sum of its proper divisors (109879891).

1212112109 is a wasteful number, since it uses less digits than its factorization.

1212112109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51764 (or 51751 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1212112109 is about 34815.4004572689. The cubic root of 1212112109 is about 1066.2218951126.

The spelling of 1212112109 in words is "one billion, two hundred twelve million, one hundred twelve thousand, one hundred nine".