15211121212 has 24 divisors (see below), whose sum is σ = 32211787104. Its totient is φ = 6135578112.

The previous prime is 15211121207. The next prime is 15211121227. The reversal of 15211121212 is 21212111251.

15211121212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15211121212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15977593 + ... + 15978544.

It is an arithmetic number, because the mean of its divisors is an integer number (1342157796).

Almost surely, 2^15211121212 is an apocalyptic number.

It is an amenable number.

15211121212 is an abundant number, since it is smaller than the sum of its proper divisors (17000665892).

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

15211121212 is a wasteful number, since it uses less digits than its factorization.

15211121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31956165 (or 31956163 counting only the distinct ones).

The product of its digits is 80, while the sum is 19.

Adding to 15211121212 its reverse (21212111251), we get a palindrome (36423232463).

The spelling of 15211121212 in words is "fifteen billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twelve".