12021013312 has 112 divisors (see below), whose sum is σ = 30228600960. Its totient is φ = 4606617600.

The previous prime is 12021013261. The next prime is 12021013339. The reversal of 12021013312 is 21331012021.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×12021013312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 280614 + ... + 320602.

Almost surely, 2^12021013312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021013312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15114300480).

12021013312 is an abundant number, since it is smaller than the sum of its proper divisors (18207587648).

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

12021013312 is a wasteful number, since it uses less digits than its factorization.

12021013312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40080 (or 40070 counting only the distinct ones).

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

Adding to 12021013312 its reverse (21331012021), we get a palindrome (33352025333).

The spelling of 12021013312 in words is "twelve billion, twenty-one million, thirteen thousand, three hundred twelve".