12021205320 has 192 divisors, whose sum is σ = 39576176640. Its totient is φ = 3164313600.

The previous prime is 12021205303. The next prime is 12021205351. The reversal of 12021205320 is 2350212021.

12021205320 is a `hidden beast` number, since 12 + 0 + 2 + 120 + 532 + 0 = 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 = 12021205293 and 12021205302.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11017975 + ... + 11019065.

It is an arithmetic number, because the mean of its divisors is an integer number (206125920).

Almost surely, 2^12021205320 is an apocalyptic number.

12021205320 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 12021205320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19788088320).

12021205320 is an abundant number, since it is smaller than the sum of its proper divisors (27554971320).

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

12021205320 is a wasteful number, since it uses less digits than its factorization.

12021205320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 1469 counting only the distinct ones).

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

Adding to 12021205320 its reverse (2350212021), we get a palindrome (14371417341).

The spelling of 12021205320 in words is "twelve billion, twenty-one million, two hundred five thousand, three hundred twenty".