21103032121 has 8 divisors (see below), whose sum is σ = 21341750144. Its totient is φ = 20864964960.

The previous prime is 21103032053. The next prime is 21103032133. The reversal of 21103032121 is 12123030112.

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 21103032121 - 2⁷ = 21103031993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103032095 and 21103032104.

It is not an unprimeable number, because it can be changed into a prime (21103036121) 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, 97356 + ... + 227341.

It is an arithmetic number, because the mean of its divisors is an integer number (2667718768).

Almost surely, 2^21103032121 is an apocalyptic number.

It is an amenable number.

21103032121 is a deficient number, since it is larger than the sum of its proper divisors (238718023).

21103032121 is a wasteful number, since it uses less digits than its factorization.

21103032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325431.

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

Adding to 21103032121 its reverse (12123030112), we get a palindrome (33226062233).

The spelling of 21103032121 in words is "twenty-one billion, one hundred three million, thirty-two thousand, one hundred twenty-one".