21011000102 has 16 divisors (see below), whose sum is σ = 31824254592. Its totient is φ = 10403084160.

The previous prime is 21011000099. The next prime is 21011000119. The reversal of 21011000102 is 20100011012.

It is a self number, because there is not a number n which added to its sum of digits gives 21011000102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210827 + ... + 294057.

It is an arithmetic number, because the mean of its divisors is an integer number (1989015912).

Almost surely, 2^21011000102 is an apocalyptic number.

21011000102 is a deficient number, since it is larger than the sum of its proper divisors (10813254490).

21011000102 is a wasteful number, since it uses less digits than its factorization.

21011000102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84463.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21011000102 its reverse (20100011012), we get a palindrome (41111011114).

The spelling of 21011000102 in words is "twenty-one billion, eleven million, one hundred two", and thus it is an aban number.