121555275221 has 8 divisors (see below), whose sum is σ = 122015474688. Its totient is φ = 121095162000.

The previous prime is 121555275217. The next prime is 121555275223. The reversal of 121555275221 is 122572555121.

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 121555275221 - 2² = 121555275217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555275223) 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, 4914716 + ... + 4939386.

It is an arithmetic number, because the mean of its divisors is an integer number (15251934336).

Almost surely, 2^121555275221 is an apocalyptic number.

It is an amenable number.

121555275221 is a deficient number, since it is larger than the sum of its proper divisors (460199467).

121555275221 is a wasteful number, since it uses less digits than its factorization.

121555275221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43123.

The product of its digits is 70000, while the sum is 38.

The spelling of 121555275221 in words is "one hundred twenty-one billion, five hundred fifty-five million, two hundred seventy-five thousand, two hundred twenty-one".