21030332121 has 12 divisors (see below), whose sum is σ = 30390097920. Its totient is φ = 14014243800.

The previous prime is 21030332111. The next prime is 21030332129. The reversal of 21030332121 is 12123303012.

21030332121 is a `hidden beast` number, since 21 + 0 + 303 + 321 + 21 = 666.

It is not a de Polignac number, because 21030332121 - 2¹⁰ = 21030331097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030332094 and 21030332103.

It is not an unprimeable number, because it can be changed into a prime (21030332129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475801 + ... + 518118.

It is an arithmetic number, because the mean of its divisors is an integer number (2532508160).

Almost surely, 2^21030332121 is an apocalyptic number.

It is an amenable number.

21030332121 is a deficient number, since it is larger than the sum of its proper divisors (9359765799).

21030332121 is a wasteful number, since it uses less digits than its factorization.

21030332121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996276 (or 996273 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21030332121 its reverse (12123303012), we get a palindrome (33153635133).

The spelling of 21030332121 in words is "twenty-one billion, thirty million, three hundred thirty-two thousand, one hundred twenty-one".