12121031320 has 16 divisors (see below), whose sum is σ = 27272320560. Its totient is φ = 4848412512.

The previous prime is 12121031287. The next prime is 12121031357. The reversal of 12121031320 is 2313012121.

It is a junction number, because it is equal to n+sod(n) for n = 12121031294 and 12121031303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151512852 + ... + 151512931.

It is an arithmetic number, because the mean of its divisors is an integer number (1704520035).

Almost surely, 2^12121031320 is an apocalyptic number.

12121031320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121031320 is an abundant number, since it is smaller than the sum of its proper divisors (15151289240).

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

12121031320 is a wasteful number, since it uses less digits than its factorization.

12121031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303025794 (or 303025790 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12121031320 its reverse (2313012121), we get a palindrome (14434043441).

The spelling of 12121031320 in words is "twelve billion, one hundred twenty-one million, thirty-one thousand, three hundred twenty".