12221407720 has 16 divisors (see below), whose sum is σ = 27498167460. Its totient is φ = 4888563072.

The previous prime is 12221407687. The next prime is 12221407769. The reversal of 12221407720 is 2770412221.

It can be written as a sum of positive squares in 2 ways, for example, as 11727590436 + 493817284 = 108294^2 + 22222^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152767557 + ... + 152767636.

Almost surely, 2^12221407720 is an apocalyptic number.

12221407720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221407720 is an abundant number, since it is smaller than the sum of its proper divisors (15276759740).

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

12221407720 is a wasteful number, since it uses less digits than its factorization.

12221407720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305535204 (or 305535200 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

Adding to 12221407720 its reverse (2770412221), we get a palindrome (14991819941).

The spelling of 12221407720 in words is "twelve billion, two hundred twenty-one million, four hundred seven thousand, seven hundred twenty".