21012200000000 has 360 divisors, whose sum is σ = 57256001934912. Its totient is φ = 7640000000000.

The previous prime is 21012199999993. The next prime is 21012200000023. The reversal of 21012200000000 is 221012.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2199995225 + ... + 2200004775.

Almost surely, 2^{21012200000000} is an apocalyptic number.

21012200000000 is a gapful number since it is divisible by the number (20) 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 21012200000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28628000967456).

21012200000000 is an abundant number, since it is smaller than the sum of its proper divisors (36243801934912).

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

21012200000000 is an frugal number, since it uses more digits than its factorization.

21012200000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9620 (or 9569 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21012200000000 its reverse (221012), we get a palindrome (21012200221012).

The spelling of 21012200000000 in words is "twenty-one trillion, twelve billion, two hundred million", and thus it is an aban number.