21003300105 has 16 divisors (see below), whose sum is σ = 33931547520. Its totient is φ = 11093004288.

The previous prime is 21003300061. The next prime is 21003300173. The reversal of 21003300105 is 50100330012.

It is a happy number.

It is not a de Polignac number, because 21003300105 - 2⁹ = 21003299593 is a prime.

It is a super-2 number, since 2×21003300105² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6795640 + ... + 6798729.

It is an arithmetic number, because the mean of its divisors is an integer number (2120721720).

Almost surely, 2^21003300105 is an apocalyptic number.

It is an amenable number.

21003300105 is a deficient number, since it is larger than the sum of its proper divisors (12928247415).

21003300105 is a wasteful number, since it uses less digits than its factorization.

21003300105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13594480.

The product of its (nonzero) digits is 90, while the sum is 15.

Adding to 21003300105 its reverse (50100330012), we get a palindrome (71103630117).

The spelling of 21003300105 in words is "twenty-one billion, three million, three hundred thousand, one hundred five".