12001021222100 has 108 divisors (see below), whose sum is σ = 27522051538464. Its totient is φ = 4541624458560.

The previous prime is 12001021222079. The next prime is 12001021222109. The reversal of 12001021222100 is 122212010021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001021222109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26598587 + ... + 27046013.

Almost surely, 2^{12001021222100} is an apocalyptic number.

12001021222100 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 12001021222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13761025769232).

12001021222100 is an abundant number, since it is smaller than the sum of its proper divisors (15521030316364).

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

12001021222100 is a wasteful number, since it uses less digits than its factorization.

12001021222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448222 (or 448196 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12001021222100 its reverse (122212010021), we get a palindrome (12123233232121).

The spelling of 12001021222100 in words is "twelve trillion, one billion, twenty-one million, two hundred twenty-two thousand, one hundred".