1111211212209 has 24 divisors (see below), whose sum is σ = 1727250009408. Its totient is φ = 633600404640.

The previous prime is 1111211212183. The next prime is 1111211212229. The reversal of 1111211212209 is 9022121121111.

It is not a de Polignac number, because 1111211212209 - 2³¹ = 1109063728561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111211212229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8130997 + ... + 8266530.

It is an arithmetic number, because the mean of its divisors is an integer number (71968750392).

Almost surely, 2^{1111211212209} is an apocalyptic number.

It is an amenable number.

1111211212209 is a deficient number, since it is larger than the sum of its proper divisors (616038797199).

1111211212209 is a wasteful number, since it uses less digits than its factorization.

1111211212209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16398005 (or 16397998 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 1111211212209 in words is "one trillion, one hundred eleven billion, two hundred eleven million, two hundred twelve thousand, two hundred nine".