12021312120 has 64 divisors (see below), whose sum is σ = 36072324000. Its totient is φ = 3204937728.

The previous prime is 12021312113. The next prime is 12021312131. The reversal of 12021312120 is 2121312021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12021312120.

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, 673876 + ... + 691484.

Almost surely, 2^12021312120 is an apocalyptic number.

12021312120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021312120 is an abundant number, since it is smaller than the sum of its proper divisors (24051011880).

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

12021312120 is a wasteful number, since it uses less digits than its factorization.

12021312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23312 (or 23308 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12021312120 its reverse (2121312021), we get a palindrome (14142624141).

Subtracting from 12021312120 its reverse (2121312021), we obtain a palindrome (9900000099).

The spelling of 12021312120 in words is "twelve billion, twenty-one million, three hundred twelve thousand, one hundred twenty".