12021200021000 has 128 divisors (see below), whose sum is σ = 29974006389600. Its totient is φ = 4496801587200.

The previous prime is 12021200020979. The next prime is 12021200021021. The reversal of 12021200021000 is 12000212021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12021200020979) and next prime (12021200021021).

It can be written as a sum of positive squares in 16 ways, for example, as 2433593760004 + 9587606260996 = 1559998^2 + 3096386^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416996 + ... + 4921004.

Almost surely, 2^{12021200021000} is an apocalyptic number.

12021200021000 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 12021200021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14987003194800).

12021200021000 is an abundant number, since it is smaller than the sum of its proper divisors (17952806368600).

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

12021200021000 is a wasteful number, since it uses less digits than its factorization.

12021200021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504204 (or 4504190 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12021200021000 its reverse (12000212021), we get a palindrome (12033200233021).

The spelling of 12021200021000 in words is "twelve trillion, twenty-one billion, two hundred million, twenty-one thousand".