1212100022009 has 4 divisors (see below), whose sum is σ = 1226703636816. Its totient is φ = 1197496407204.

The previous prime is 1212100021999. The next prime is 1212100022033. The reversal of 1212100022009 is 9002200012121.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1212100022009 - 2²⁰ = 1212098973433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212100042009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7301807279 + ... + 7301807444.

It is an arithmetic number, because the mean of its divisors is an integer number (306675909204).

Almost surely, 2^{1212100022009} is an apocalyptic number.

It is an amenable number.

1212100022009 is a deficient number, since it is larger than the sum of its proper divisors (14603614807).

1212100022009 is an equidigital number, since it uses as much as digits as its factorization.

1212100022009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14603614806.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 1212100022009 in words is "one trillion, two hundred twelve billion, one hundred million, twenty-two thousand, nine".