21020002012 has 6 divisors (see below), whose sum is σ = 36785003528. Its totient is φ = 10510001004.

The previous prime is 21020002001. The next prime is 21020002063.

21020002012 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21020002012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627500248 + ... + 2627500255.

Almost surely, 2^21020002012 is an apocalyptic number.

It is an amenable number.

21020002012 is a deficient number, since it is larger than the sum of its proper divisors (15765001516).

21020002012 is a wasteful number, since it uses less digits than its factorization.

21020002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255000507 (or 5255000505 counting only the distinct ones).

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

It can be divided in two parts, 2102000 and 2012, that added together give a palindrome (2104012).

The spelling of 21020002012 in words is "twenty-one billion, twenty million, two thousand, twelve".