121217055 has 64 divisors (see below), whose sum is σ = 218972160. Its totient is φ = 56899584.

The previous prime is 121217009. The next prime is 121217081. The reversal of 121217055 is 550712121.

It is not a de Polignac number, because 121217055 - 2¹¹ = 121215007 is a prime.

It is a super-3 number, since 3×121217055³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 615217 + ... + 615413.

It is an arithmetic number, because the mean of its divisors is an integer number (3421440).

Almost surely, 2^121217055 is an apocalyptic number.

121217055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121217055 is a deficient number, since it is larger than the sum of its proper divisors (97755105).

121217055 is a wasteful number, since it uses less digits than its factorization.

121217055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368.

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 121217055 is about 11009.8617157528. The cubic root of 121217055 is about 494.9043177983.

Adding to 121217055 its reverse (550712121), we get a palindrome (671929176).

The spelling of 121217055 in words is "one hundred twenty-one million, two hundred seventeen thousand, fifty-five".