21002012002 has 16 divisors (see below), whose sum is σ = 32656841280. Its totient is φ = 10121703408.

The previous prime is 21002011999. The next prime is 21002012021. The reversal of 21002012002 is 20021020012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002012002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318302 + ... + 1334137.

It is an arithmetic number, because the mean of its divisors is an integer number (2041052580).

Almost surely, 2^21002012002 is an apocalyptic number.

21002012002 is a deficient number, since it is larger than the sum of its proper divisors (11654829278).

21002012002 is a wasteful number, since it uses less digits than its factorization.

21002012002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652585.

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

Adding to 21002012002 its reverse (20021020012), we get a palindrome (41023032014).

It can be divided in two parts, 2100 and 2012002, that added together give a palindrome (2014102).

The spelling of 21002012002 in words is "twenty-one billion, two million, twelve thousand, two".