12121211320 has 32 divisors (see below), whose sum is σ = 27275991120. Its totient is φ = 4847904000.

The previous prime is 12121211273. The next prime is 12121211321. The reversal of 12121211320 is 2311212121.

It is a super-2 number, since 2×12121211320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12121211294 and 12121211303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121211321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509695 + ... + 532945.

Almost surely, 2^12121211320 is an apocalyptic number.

12121211320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121211320 is an abundant number, since it is smaller than the sum of its proper divisors (15154779800).

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

12121211320 is a wasteful number, since it uses less digits than its factorization.

12121211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36295 (or 36291 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12121211320 its reverse (2311212121), we get a palindrome (14432423441).

The spelling of 12121211320 in words is "twelve billion, one hundred twenty-one million, two hundred eleven thousand, three hundred twenty".