12121240 has 64 divisors (see below), whose sum is σ = 29484000. Its totient is φ = 4469760.

The previous prime is 12121231. The next prime is 12121267. The reversal of 12121240 is 4212121.

It is a happy number.

12121240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 12121240.

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, 30966 + ... + 31354.

Almost surely, 2^12121240 is an apocalyptic number.

12121240 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 12121240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14742000).

12121240 is an abundant number, since it is smaller than the sum of its proper divisors (17362760).

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

12121240 is a wasteful number, since it uses less digits than its factorization.

12121240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12121240 is about 3481.5571228977. The cubic root of 12121240 is about 229.7112949726.

Adding to 12121240 its reverse (4212121), we get a palindrome (16333361).

The spelling of 12121240 in words is "twelve million, one hundred twenty-one thousand, two hundred forty".