121511104 has 168 divisors, whose sum is σ = 306470304. Its totient is φ = 47308800.

The previous prime is 121511101. The next prime is 121511111. The reversal of 121511104 is 401115121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (121511101) 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 23 ways as a sum of consecutive naturals, for example, 1711389 + ... + 1711459.

It is an arithmetic number, because the mean of its divisors is an integer number (1824228).

Almost surely, 2^121511104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121511104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153235152).

121511104 is an abundant number, since it is smaller than the sum of its proper divisors (184959200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121511104 is a wasteful number, since it uses less digits than its factorization.

121511104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 121511104 is about 11023.2075186853. The cubic root of 121511104 is about 495.3041751874.

Adding to 121511104 its reverse (401115121), we get a palindrome (522626225).

It can be divided in two parts, 121 and 511104, that added together give a square (511225 = 715²).

The spelling of 121511104 in words is "one hundred twenty-one million, five hundred eleven thousand, one hundred four".