1217220700721 has 8 divisors (see below), whose sum is σ = 1228048725504. Its totient is φ = 1206420838560.

The previous prime is 1217220700711. The next prime is 1217220700723. The reversal of 1217220700721 is 1270070227121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217220700721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217220700723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6953825 + ... + 7126718.

It is an arithmetic number, because the mean of its divisors is an integer number (153506090688).

Almost surely, 2^{1217220700721} is an apocalyptic number.

It is an amenable number.

1217220700721 is a deficient number, since it is larger than the sum of its proper divisors (10828024783).

1217220700721 is a wasteful number, since it uses less digits than its factorization.

1217220700721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14081311.

The product of its (nonzero) digits is 5488, while the sum is 32.

Adding to 1217220700721 its reverse (1270070227121), we get a palindrome (2487290927842).

The spelling of 1217220700721 in words is "one trillion, two hundred seventeen billion, two hundred twenty million, seven hundred thousand, seven hundred twenty-one".