121005500 has 144 divisors (see below), whose sum is σ = 336117600. Its totient is φ = 37632000.

The previous prime is 121005491. The next prime is 121005529. The reversal of 121005500 is 5500121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269276 + ... + 269724.

It is an arithmetic number, because the mean of its divisors is an integer number (2334150).

Almost surely, 2^121005500 is an apocalyptic number.

121005500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121005500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168058800).

121005500 is an abundant number, since it is smaller than the sum of its proper divisors (215112100).

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

121005500 is a wasteful number, since it uses less digits than its factorization.

121005500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 121005500 is about 11000.2499971592. The cubic root of 121005500 is about 494.6162382832.

Adding to 121005500 its reverse (5500121), we get a palindrome (126505621).

The spelling of 121005500 in words is "one hundred twenty-one million, five thousand, five hundred".