121113553 has 4 divisors (see below), whose sum is σ = 132123888. Its totient is φ = 110103220.

The previous prime is 121113527. The next prime is 121113569. The reversal of 121113553 is 355311121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355311121 = 11 ⋅32301011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121113553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121116553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505151 + ... + 5505172.

It is an arithmetic number, because the mean of its divisors is an integer number (33030972).

Almost surely, 2^121113553 is an apocalyptic number.

It is an amenable number.

121113553 is a deficient number, since it is larger than the sum of its proper divisors (11010335).

121113553 is a wasteful number, since it uses less digits than its factorization.

121113553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010334.

The product of its digits is 450, while the sum is 22.

The square root of 121113553 is about 11005.1602896096. The cubic root of 121113553 is about 494.7634185582.

Adding to 121113553 its reverse (355311121), we get a palindrome (476424674).

The spelling of 121113553 in words is "one hundred twenty-one million, one hundred thirteen thousand, five hundred fifty-three".