1212210112109 has 16 divisors (see below), whose sum is σ = 1271407777920. Its totient is φ = 1153564104000.

The previous prime is 1212210112103. The next prime is 1212210112153. The reversal of 1212210112109 is 9012110122121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212210112109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210112103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4943207 + ... + 5182635.

It is an arithmetic number, because the mean of its divisors is an integer number (79462986120).

Almost surely, 2^{1212210112109} is an apocalyptic number.

It is an amenable number.

1212210112109 is a deficient number, since it is larger than the sum of its proper divisors (59197665811).

1212210112109 is a wasteful number, since it uses less digits than its factorization.

1212210112109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240580.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1212210112109 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred twelve thousand, one hundred nine".