12121860 has 24 divisors (see below), whose sum is σ = 33941376. Its totient is φ = 3232480.

The previous prime is 12121831. The next prime is 12121871. The reversal of 12121860 is 6812121.

12121860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100956 + ... + 101075.

It is an arithmetic number, because the mean of its divisors is an integer number (1414224).

Almost surely, 2^12121860 is an apocalyptic number.

12121860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121860 is an abundant number, since it is smaller than the sum of its proper divisors (21819516).

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

12121860 is a wasteful number, since it uses less digits than its factorization.

12121860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202043 (or 202041 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 12121860 is about 3481.6461623778. The cubic root of 12121860 is about 229.7152114744.

Adding to 12121860 its reverse (6812121), we get a palindrome (18933981).

It can be divided in two parts, 121218 and 60, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 12121860 in words is "twelve million, one hundred twenty-one thousand, eight hundred sixty".