12216542388 has 24 divisors (see below), whose sum is σ = 28507274208. Its totient is φ = 4071893856.

The previous prime is 12216542381. The next prime is 12216542389. The reversal of 12216542388 is 88324561221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216542381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207670 + ... + 259922.

It is an arithmetic number, because the mean of its divisors is an integer number (1187803092).

Almost surely, 2^12216542388 is an apocalyptic number.

It is an amenable number.

12216542388 is an abundant number, since it is smaller than the sum of its proper divisors (16290731820).

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

12216542388 is a wasteful number, since it uses less digits than its factorization.

12216542388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71743 (or 71741 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The spelling of 12216542388 in words is "twelve billion, two hundred sixteen million, five hundred forty-two thousand, three hundred eighty-eight".