21110002020000 has 360 divisors, whose sum is σ = 75256854472800. Its totient is φ = 5611218240000.

The previous prime is 21110002019989. The next prime is 21110002020077. The reversal of 21110002020000 is 2020001112.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 55791451 + ... + 56168549.

It is an arithmetic number, because the mean of its divisors is an integer number (209046817980).

Almost surely, 2^{21110002020000} is an apocalyptic number.

21110002020000 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 21110002020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37628427236400).

21110002020000 is an abundant number, since it is smaller than the sum of its proper divisors (54146852452800).

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

21110002020000 is a wasteful number, since it uses less digits than its factorization.

21110002020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377446 (or 377420 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21110002020000 its reverse (2020001112), we get a palindrome (21112022021112).

The spelling of 21110002020000 in words is "twenty-one trillion, one hundred ten billion, two million, twenty thousand".