12001091520 has 224 divisors, whose sum is σ = 44013217536. Its totient is φ = 2738176000.

The previous prime is 12001091423. The next prime is 12001091527. The reversal of 12001091520 is 2519010021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001091527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146095 + ... + 212945.

Almost surely, 2^12001091520 is an apocalyptic number.

12001091520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12001091520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22006608768).

12001091520 is an abundant number, since it is smaller than the sum of its proper divisors (32012126016).

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

12001091520 is a wasteful number, since it uses less digits than its factorization.

12001091520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66899 (or 66889 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The spelling of 12001091520 in words is "twelve billion, one million, ninety-one thousand, five hundred twenty".