21012000103 has 8 divisors (see below), whose sum is σ = 21323716128. Its totient is φ = 20702355744.

The previous prime is 21012000101. The next prime is 21012000109. The reversal of 21012000103 is 30100021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012000103 - 2¹ = 21012000101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012000103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012000101) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 497476 + ... + 538057.

It is an arithmetic number, because the mean of its divisors is an integer number (2665464516).

Almost surely, 2^21012000103 is an apocalyptic number.

21012000103 is a deficient number, since it is larger than the sum of its proper divisors (311716025).

21012000103 is a wasteful number, since it uses less digits than its factorization.

21012000103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035833.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21012000103 its reverse (30100021012), we get a palindrome (51112021115).

The spelling of 21012000103 in words is "twenty-one billion, twelve million, one hundred three", and thus it is an aban number.