2100021000000 has 784 divisors, whose sum is σ = 8660019150336. Its totient is φ = 436320000000.

The previous prime is 2100020999983. The next prime is 2100021000013. The reversal of 2100021000000 is 1200012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 230995455 + ... + 231004545.

Almost surely, 2^{2100021000000} is an apocalyptic number.

2100021000000 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 2100021000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4330009575168).

2100021000000 is an abundant number, since it is smaller than the sum of its proper divisors (6559998150336).

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

2100021000000 is an frugal number, since it uses more digits than its factorization.

2100021000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9154 (or 9119 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 2100021000000 its reverse (1200012), we get a palindrome (2100022200012).

The spelling of 2100021000000 in words is "two trillion, one hundred billion, twenty-one million", and thus it is an aban number.