12215534212 has 96 divisors (see below), whose sum is σ = 26133359616. Its totient is φ = 4877107200.

The previous prime is 12215534203. The next prime is 12215534237. The reversal of 12215534212 is 21243551221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36247708 + ... + 36248044.

It is an arithmetic number, because the mean of its divisors is an integer number (272222496).

Almost surely, 2^12215534212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12215534212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13066679808).

12215534212 is an abundant number, since it is smaller than the sum of its proper divisors (13917825404).

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

12215534212 is a wasteful number, since it uses less digits than its factorization.

12215534212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The spelling of 12215534212 in words is "twelve billion, two hundred fifteen million, five hundred thirty-four thousand, two hundred twelve".