4155111212 has 18 divisors (see below), whose sum is σ = 8458619652. Its totient is φ = 1780761864.

The previous prime is 4155111157. The next prime is 4155111217. The reversal of 4155111212 is 2121115514.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (4155111217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10599578 + ... + 10599969.

It is an arithmetic number, because the mean of its divisors is an integer number (469923314).

Almost surely, 2^4155111212 is an apocalyptic number.

It is an amenable number.

4155111212 is an abundant number, since it is smaller than the sum of its proper divisors (4303508440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4155111212 is a wasteful number, since it uses less digits than its factorization.

4155111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21199565 (or 21199556 counting only the distinct ones).

The product of its digits is 400, while the sum is 23.

The square root of 4155111212 is about 64460.1521251695. The cubic root of 4155111212 is about 1607.6600412273.

Adding to 4155111212 its reverse (2121115514), we get a palindrome (6276226726).

The spelling of 4155111212 in words is "four billion, one hundred fifty-five million, one hundred eleven thousand, two hundred twelve".