121006555 has 8 divisors (see below), whose sum is σ = 145722672. Its totient is φ = 96462048.

The previous prime is 121006553. The next prime is 121006583. The reversal of 121006555 is 555600121.

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 121006555 - 2¹ = 121006553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121006553) 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, 41344 + ... + 44173.

It is an arithmetic number, because the mean of its divisors is an integer number (18215334).

Almost surely, 2^121006555 is an apocalyptic number.

121006555 is a deficient number, since it is larger than the sum of its proper divisors (24716117).

121006555 is an equidigital number, since it uses as much as digits as its factorization.

121006555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85805.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 121006555 is about 11000.2979505102. The cubic root of 121006555 is about 494.6176757347.

Adding to 121006555 its reverse (555600121), we get a palindrome (676606676).

The spelling of 121006555 in words is "one hundred twenty-one million, six thousand, five hundred fifty-five".