1021111002000 has 320 divisors, whose sum is σ = 3735682329600. Its totient is φ = 266502067200.

The previous prime is 1021111001993. The next prime is 1021111002017. The reversal of 1021111002000 is 2001111201.

It is a happy number.

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 63 ways as a sum of consecutive naturals, for example, 2336836 + ... + 2739164.

It is an arithmetic number, because the mean of its divisors is an integer number (11674007280).

Almost surely, 2^{1021111002000} is an apocalyptic number.

1021111002000 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 1021111002000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867841164800).

1021111002000 is an abundant number, since it is smaller than the sum of its proper divisors (2714571327600).

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

1021111002000 is a wasteful number, since it uses less digits than its factorization.

1021111002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402408 (or 402386 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1021111002000 its reverse (2001111201), we get a palindrome (1023112113201).

The spelling of 1021111002000 in words is "one trillion, twenty-one billion, one hundred eleven million, two thousand".