12111021320 has 64 divisors (see below), whose sum is σ = 27502478640. Its totient is φ = 4799692800.

The previous prime is 12111021319. The next prime is 12111021343. The reversal of 12111021320 is 2312011121.

It can be written as a sum of positive squares in 8 ways, for example, as 165842884 + 11945178436 = 12878^2 + 109294^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12111021295 and 12111021304.

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, 2031464 + ... + 2037416.

Almost surely, 2^12111021320 is an apocalyptic number.

12111021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111021320 is an abundant number, since it is smaller than the sum of its proper divisors (15391457320).

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

12111021320 is a wasteful number, since it uses less digits than its factorization.

12111021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6426 (or 6422 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12111021320 its reverse (2312011121), we get a palindrome (14423032441).

The spelling of 12111021320 in words is "twelve billion, one hundred eleven million, twenty-one thousand, three hundred twenty".