12221707821720 has 64 divisors (see below), whose sum is σ = 36666018131040. Its totient is φ = 3259042560000.

The previous prime is 12221707821667. The next prime is 12221707821727. The reversal of 12221707821720 is 2712870712221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221707821727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3779970 + ... + 6223470.

Almost surely, 2^{12221707821720} is an apocalyptic number.

12221707821720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221707821720 is an abundant number, since it is smaller than the sum of its proper divisors (24444310309320).

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

12221707821720 is a wasteful number, since it uses less digits than its factorization.

12221707821720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2485196 (or 2485192 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The spelling of 12221707821720 in words is "twelve trillion, two hundred twenty-one billion, seven hundred seven million, eight hundred twenty-one thousand, seven hundred twenty".