121056556217 has 8 divisors (see below), whose sum is σ = 121836046080. Its totient is φ = 120277515600.

The previous prime is 121056556193. The next prime is 121056556267. The reversal of 121056556217 is 712655650121.

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 121056556217 - 2¹² = 121056552121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121056556267) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 436967 + ... + 658067.

It is an arithmetic number, because the mean of its divisors is an integer number (15229505760).

Almost surely, 2^121056556217 is an apocalyptic number.

It is an amenable number.

121056556217 is a deficient number, since it is larger than the sum of its proper divisors (779489863).

121056556217 is a wasteful number, since it uses less digits than its factorization.

121056556217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224623.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 121056556217 in words is "one hundred twenty-one billion, fifty-six million, five hundred fifty-six thousand, two hundred seventeen".