121221500 has 96 divisors (see below), whose sum is σ = 281788416. Its totient is φ = 45460800.

The previous prime is 121221497. The next prime is 121221521. The reversal of 121221500 is 5122121.

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, 954437 + ... + 954563.

It is an arithmetic number, because the mean of its divisors is an integer number (2935296).

Almost surely, 2^121221500 is an apocalyptic number.

121221500 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 121221500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140894208).

121221500 is an abundant number, since it is smaller than the sum of its proper divisors (160566916).

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

121221500 is a wasteful number, since it uses less digits than its factorization.

121221500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 121221500 is about 11010.0635783814. The cubic root of 121221500 is about 494.9103670648.

Adding to 121221500 its reverse (5122121), we get a palindrome (126343621).

The spelling of 121221500 in words is "one hundred twenty-one million, two hundred twenty-one thousand, five hundred".