121553500 has 96 divisors (see below), whose sum is σ = 280687680. Its totient is φ = 45920000.

The previous prime is 121553489. The next prime is 121553521. The reversal of 121553500 is 5355121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1203450 + ... + 1203550.

It is an arithmetic number, because the mean of its divisors is an integer number (2923830).

Almost surely, 2^121553500 is an apocalyptic number.

121553500 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 121553500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140343840).

121553500 is an abundant number, since it is smaller than the sum of its proper divisors (159134180).

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

121553500 is a wasteful number, since it uses less digits than its factorization.

121553500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 121553500 is about 11025.1303847165. The cubic root of 121553500 is about 495.3617734188.

The spelling of 121553500 in words is "one hundred twenty-one million, five hundred fifty-three thousand, five hundred".