1221550756673 has 8 divisors (see below), whose sum is σ = 1316544768000. Its totient is φ = 1126703683728.

The previous prime is 1221550756639. The next prime is 1221550756681. The reversal of 1221550756673 is 3766570551221.

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 1221550756673 - 2⁶ = 1221550756609 is a prime.

It is a super-2 number, since 2×1221550756673² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221550756693) 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, 36717323 + ... + 36750576.

It is an arithmetic number, because the mean of its divisors is an integer number (164568096000).

Almost surely, 2^{1221550756673} is an apocalyptic number.

1221550756673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221550756673 is a deficient number, since it is larger than the sum of its proper divisors (94994011327).

1221550756673 is a wasteful number, since it uses less digits than its factorization.

1221550756673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73469191.

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 1221550756673 in words is "one trillion, two hundred twenty-one billion, five hundred fifty million, seven hundred fifty-six thousand, six hundred seventy-three".