12021520320 has 168 divisors, whose sum is σ = 42311061936. Its totient is φ = 3131154432.

The previous prime is 12021520271. The next prime is 12021520339. The reversal of 12021520320 is 2302512021.

12021520320 is a `hidden beast` number, since 120 + 2 + 1 + 520 + 3 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12021520293 and 12021520302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75304 + ... + 172376.

Almost surely, 2^12021520320 is an apocalyptic number.

12021520320 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 12021520320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21155530968).

12021520320 is an abundant number, since it is smaller than the sum of its proper divisors (30289541616).

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

12021520320 is a wasteful number, since it uses less digits than its factorization.

12021520320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97139 (or 97126 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The spelling of 12021520320 in words is "twelve billion, twenty-one million, five hundred twenty thousand, three hundred twenty".