21103300021 has 8 divisors (see below), whose sum is σ = 21329904960. Its totient is φ = 20877239328.

The previous prime is 21103299991. The next prime is 21103300033. The reversal of 21103300021 is 12000330112.

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 21103300021 - 2¹³ = 21103291829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103299974 and 21103300010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103300061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57856 + ... + 213433.

It is an arithmetic number, because the mean of its divisors is an integer number (2666238120).

Almost surely, 2^21103300021 is an apocalyptic number.

It is an amenable number.

21103300021 is a deficient number, since it is larger than the sum of its proper divisors (226604939).

21103300021 is a wasteful number, since it uses less digits than its factorization.

21103300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272123.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21103300021 its reverse (12000330112), we get a palindrome (33103630133).

The spelling of 21103300021 in words is "twenty-one billion, one hundred three million, three hundred thousand, twenty-one".