12121660 has 12 divisors (see below), whose sum is σ = 25455528. Its totient is φ = 4848656.

The previous prime is 12121631. The next prime is 12121661. The reversal of 12121660 is 6612121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303022 + ... + 303061.

It is an arithmetic number, because the mean of its divisors is an integer number (2121294).

Almost surely, 2^12121660 is an apocalyptic number.

12121660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121660 is an abundant number, since it is smaller than the sum of its proper divisors (13333868).

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

12121660 is a wasteful number, since it uses less digits than its factorization.

12121660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606092 (or 606090 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12121660 is about 3481.6174402137. The cubic root of 12121660 is about 229.7139481013.

Adding to 12121660 its reverse (6612121), we get a palindrome (18733781).

The spelling of 12121660 in words is "twelve million, one hundred twenty-one thousand, six hundred sixty".