21002002012 has 24 divisors (see below), whose sum is σ = 37760178960. Its totient is φ = 10213580160.

The previous prime is 21002002001. The next prime is 21002002037. The reversal of 21002002012 is 21020020012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002002012.

It is a congruent number.

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, 422064 + ... + 469192.

It is an arithmetic number, because the mean of its divisors is an integer number (1573340790).

Almost surely, 2^21002002012 is an apocalyptic number.

It is an amenable number.

21002002012 is a deficient number, since it is larger than the sum of its proper divisors (16758176948).

21002002012 is a wasteful number, since it uses less digits than its factorization.

21002002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50181 (or 50179 counting only the distinct ones).

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

Adding to 21002002012 its reverse (21020020012), we get a palindrome (42022022024).

The spelling of 21002002012 in words is "twenty-one billion, two million, two thousand, twelve".