12207217720 has 16 divisors (see below), whose sum is σ = 27466239960. Its totient is φ = 4882887072.

The previous prime is 12207217699. The next prime is 12207217721. The reversal of 12207217720 is 2771270221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12207217721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152590182 + ... + 152590261.

Almost surely, 2^12207217720 is an apocalyptic number.

12207217720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12207217720 is an abundant number, since it is smaller than the sum of its proper divisors (15259022240).

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

12207217720 is a wasteful number, since it uses less digits than its factorization.

12207217720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305180454 (or 305180450 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 31.

Adding to 12207217720 its reverse (2771270221), we get a palindrome (14978487941).

The spelling of 12207217720 in words is "twelve billion, two hundred seven million, two hundred seventeen thousand, seven hundred twenty".