12021000001320 has 64 divisors (see below), whose sum is σ = 36063452085120. Its totient is φ = 3205559815424.

The previous prime is 12021000001243. The next prime is 12021000001337. The reversal of 12021000001320 is 2310000012021.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12021000001296 and 12021000001305.

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, 9687754 + ... + 10857926.

It is an arithmetic number, because the mean of its divisors is an integer number (563491438830).

Almost surely, 2^{12021000001320} is an apocalyptic number.

12021000001320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021000001320 is an abundant number, since it is smaller than the sum of its proper divisors (24042452083800).

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

12021000001320 is a wasteful number, since it uses less digits than its factorization.

12021000001320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255794 (or 1255790 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 12021000001320 its reverse (2310000012021), we get a palindrome (14331000013341).

The spelling of 12021000001320 in words is "twelve trillion, twenty-one billion, one thousand, three hundred twenty".