1021002001200 has 90 divisors (see below), whose sum is σ = 3543160568324. Its totient is φ = 272267199360.

The previous prime is 1021002001181. The next prime is 1021002001247. The reversal of 1021002001200 is 21002001201.

It is a tau number, because it is divible by the number of its divisors (90).

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 17 ways as a sum of consecutive naturals, for example, 141802234 + ... + 141809433.

Almost surely, 2^{1021002001200} is an apocalyptic number.

1021002001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021002001200 is an abundant number, since it is smaller than the sum of its proper divisors (2522158567124).

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

1021002001200 is a wasteful number, since it uses less digits than its factorization.

1021002001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283611691 (or 283611677 counting only the distinct ones).

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

Adding to 1021002001200 its reverse (21002001201), we get a palindrome (1042004002401).

Subtracting from 1021002001200 its reverse (21002001201), we obtain a palindrome (999999999999).

The spelling of 1021002001200 in words is "one trillion, twenty-one billion, two million, one thousand, two hundred".