121345555 has 8 divisors (see below), whose sum is σ = 146034000. Its totient is φ = 96796896.

The previous prime is 121345519. The next prime is 121345559. The reversal of 121345555 is 555543121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121345555 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121345559) 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, 33025 + ... + 36514.

It is an arithmetic number, because the mean of its divisors is an integer number (18254250).

Almost surely, 2^121345555 is an apocalyptic number.

121345555 is a deficient number, since it is larger than the sum of its proper divisors (24688445).

121345555 is an equidigital number, since it uses as much as digits as its factorization.

121345555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69893.

The product of its digits is 15000, while the sum is 31.

The square root of 121345555 is about 11015.6958472899. The cubic root of 121345555 is about 495.0791357341.

Adding to 121345555 its reverse (555543121), we get a palindrome (676888676).

It can be divided in two parts, 12134 and 5555, that added together give a square (17689 = 133²).

The spelling of 121345555 in words is "one hundred twenty-one million, three hundred forty-five thousand, five hundred fifty-five".