1021200002002 has 16 divisors (see below), whose sum is σ = 1570576051800. Its totient is φ = 497697112960.

The previous prime is 1021200001993. The next prime is 1021200002003. The reversal of 1021200002002 is 2002000021201.

It can be written as a sum of positive squares in 4 ways, for example, as 528661322281 + 492538679721 = 727091^2 + 701811^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1021200002002.

It is not an unprimeable number, because it can be changed into a prime (1021200002003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5523877 + ... + 5705752.

Almost surely, 2^{1021200002002} is an apocalyptic number.

1021200002002 is a deficient number, since it is larger than the sum of its proper divisors (549376049798).

1021200002002 is a wasteful number, since it uses less digits than its factorization.

1021200002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11230781.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 1021200002002 its reverse (2002000021201), we get a palindrome (3023200023203).

The spelling of 1021200002002 in words is "one trillion, twenty-one billion, two hundred million, two thousand, two".