11615521212 has 18 divisors (see below), whose sum is σ = 29361456488. Its totient is φ = 3871840392.

The previous prime is 11615521207. The next prime is 11615521213. The reversal of 11615521212 is 21212551611.

It is a happy number.

11615521212 is a `hidden beast` number, since 1 + 1 + 615 + 5 + 21 + 21 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11615521213) 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, 161326648 + ... + 161326719.

Almost surely, 2^11615521212 is an apocalyptic number.

11615521212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11615521212 is an abundant number, since it is smaller than the sum of its proper divisors (17745935276).

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

11615521212 is a wasteful number, since it uses less digits than its factorization.

11615521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322653377 (or 322653372 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The spelling of 11615521212 in words is "eleven billion, six hundred fifteen million, five hundred twenty-one thousand, two hundred twelve".