1217521222720 has 112 divisors (see below), whose sum is σ = 3236341699008. Its totient is φ = 432438773760.

The previous prime is 1217521222699. The next prime is 1217521222759. The reversal of 1217521222720 is 272221257121.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3870579 + ... + 4173298.

Almost surely, 2^{1217521222720} is an apocalyptic number.

1217521222720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217521222720 is an abundant number, since it is smaller than the sum of its proper divisors (2018820476288).

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

1217521222720 is a wasteful number, since it uses less digits than its factorization.

1217521222720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8043948 (or 8043938 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

Adding to 1217521222720 its reverse (272221257121), we get a palindrome (1489742479841).

The spelling of 1217521222720 in words is "one trillion, two hundred seventeen billion, five hundred twenty-one million, two hundred twenty-two thousand, seven hundred twenty".