1002012021000 has 192 divisors, whose sum is σ = 3406382806320. Its totient is φ = 265658265600.

The previous prime is 1002012020959. The next prime is 1002012021107. The reversal of 1002012021000 is 1202102001.

It can be written as a sum of positive squares in 8 ways, for example, as 137212458084 + 864799562916 = 370422^2 + 929946^2 .

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 47 ways as a sum of consecutive naturals, for example, 1235224 + ... + 1878776.

Almost surely, 2^{1002012021000} is an apocalyptic number.

1002012021000 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 1002012021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703191403160).

1002012021000 is an abundant number, since it is smaller than the sum of its proper divisors (2404370785320).

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

1002012021000 is a wasteful number, since it uses less digits than its factorization.

1002012021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643753 (or 643736 counting only the distinct ones).

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

Adding to 1002012021000 its reverse (1202102001), we get a palindrome (1003214123001).

The spelling of 1002012021000 in words is "one trillion, two billion, twelve million, twenty-one thousand".