21103302121 has 16 divisors (see below), whose sum is σ = 24384689280. Its totient is φ = 18049870080.

The previous prime is 21103302113. The next prime is 21103302137. The reversal of 21103302121 is 12120330112.

It is not a de Polignac number, because 21103302121 - 2³ = 21103302113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103302095 and 21103302104.

It is not an unprimeable number, because it can be changed into a prime (21103302221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 549340 + ... + 586498.

It is an arithmetic number, because the mean of its divisors is an integer number (1524043080).

Almost surely, 2^21103302121 is an apocalyptic number.

It is an amenable number.

21103302121 is a deficient number, since it is larger than the sum of its proper divisors (3281387159).

21103302121 is a wasteful number, since it uses less digits than its factorization.

21103302121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40224.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21103302121 its reverse (12120330112), we get a palindrome (33223632233).

The spelling of 21103302121 in words is "twenty-one billion, one hundred three million, three hundred two thousand, one hundred twenty-one".