1020020001000 has 1024 divisors, whose sum is σ = 4411196375040. Its totient is φ = 189319680000.

The previous prime is 1020020000999. The next prime is 1020020001043. The reversal of 1020020001000 is 1000200201.

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 self number, because there is not a number n which added to its sum of digits gives 1020020001000.

It is an unprimeable number.

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 255 ways as a sum of consecutive naturals, for example, 93087522 + ... + 93098478.

It is an arithmetic number, because the mean of its divisors is an integer number (4307808960).

Almost surely, 2^{1020020001000} is an apocalyptic number.

1020020001000 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 1020020001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2205598187520).

1020020001000 is an abundant number, since it is smaller than the sum of its proper divisors (3391176374040).

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

1020020001000 is a wasteful number, since it uses less digits than its factorization.

1020020001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11043 (or 11029 counting only the distinct ones).

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

Adding to 1020020001000 its reverse (1000200201), we get a palindrome (1021020201201).

The spelling of 1020020001000 in words is "one trillion, twenty billion, twenty million, one thousand".