1220120784817 has 8 divisors (see below), whose sum is σ = 1331236019520. Its totient is φ = 1109038077360.

The previous prime is 1220120784787. The next prime is 1220120784893. The reversal of 1220120784817 is 7184870210221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220120784817 - 2¹⁹ = 1220120260529 is a prime.

It is a super-3 number, since 3×1220120784817³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220120787817) 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, 8053342 + ... + 8203447.

It is an arithmetic number, because the mean of its divisors is an integer number (166404502440).

Almost surely, 2^{1220120784817} is an apocalyptic number.

It is an amenable number.

1220120784817 is a deficient number, since it is larger than the sum of its proper divisors (111115234703).

1220120784817 is a wasteful number, since it uses less digits than its factorization.

1220120784817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16263623.

The product of its (nonzero) digits is 100352, while the sum is 43.

The spelling of 1220120784817 in words is "one trillion, two hundred twenty billion, one hundred twenty million, seven hundred eighty-four thousand, eight hundred seventeen".