1000021020000 has 240 divisors, whose sum is σ = 3283898753520. Its totient is φ = 266377216000.

The previous prime is 1000021019969. The next prime is 1000021020001. The reversal of 1000021020000 is 201200001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

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 not an unprimeable number, because it can be changed into a prime (1000021020001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 57171256 + ... + 57188744.

It is an arithmetic number, because the mean of its divisors is an integer number (13682911473).

Almost surely, 2^{1000021020000} is an apocalyptic number.

1000021020000 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 1000021020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1641949376760).

1000021020000 is an abundant number, since it is smaller than the sum of its proper divisors (2283877733520).

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

1000021020000 is an equidigital number, since it uses as much as digits as its factorization.

1000021020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18475 (or 18452 counting only the distinct ones).

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

Adding to 1000021020000 its reverse (201200001), we get a palindrome (1000222220001).

The spelling of 1000021020000 in words is "one trillion, twenty-one million, twenty thousand".