21001020002002 has 32 divisors (see below), whose sum is σ = 32961139280640. Its totient is φ = 10016490200640.

The previous prime is 21001020001939. The next prime is 21001020002069. The reversal of 21001020002002 is 20020002010012.

It is a super-2 number, since 2×21001020002002² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21001020002002.

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 15 ways as a sum of consecutive naturals, for example, 53817363 + ... + 54206185.

It is an arithmetic number, because the mean of its divisors is an integer number (1030035602520).

Almost surely, 2^{21001020002002} is an apocalyptic number.

21001020002002 is a deficient number, since it is larger than the sum of its proper divisors (11960119278638).

21001020002002 is a wasteful number, since it uses less digits than its factorization.

21001020002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392058.

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

Adding to 21001020002002 its reverse (20020002010012), we get a palindrome (41021022012014).

The spelling of 21001020002002 in words is "twenty-one trillion, one billion, twenty million, two thousand, two".