12121500 has 48 divisors (see below), whose sum is σ = 35302176. Its totient is φ = 3232000.

The previous prime is 12121481. The next prime is 12121511. The reversal of 12121500 is 512121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2541 + ... + 5540.

It is an arithmetic number, because the mean of its divisors is an integer number (735462).

Almost surely, 2^12121500 is an apocalyptic number.

12121500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121500 is an abundant number, since it is smaller than the sum of its proper divisors (23180676).

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

12121500 is a wasteful number, since it uses less digits than its factorization.

12121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103 (or 8091 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 12121500 is about 3481.5944623118. The cubic root of 12121500 is about 229.7129373929.

Adding to 12121500 its reverse (512121), we get a palindrome (12633621).

It can be divided in two parts, 12121 and 500, that added together give a palindrome (12621).

The spelling of 12121500 in words is "twelve million, one hundred twenty-one thousand, five hundred".