21033020121 has 8 divisors (see below), whose sum is σ = 29520028320. Its totient is φ = 13284012672.

The previous prime is 21033020087. The next prime is 21033020179. The reversal of 21033020121 is 12102033012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21033020121 - 2¹¹ = 21033018073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21033020121.

It is not an unprimeable number, because it can be changed into a prime (21033020321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184500120 + ... + 184500233.

It is an arithmetic number, because the mean of its divisors is an integer number (3690003540).

Almost surely, 2^21033020121 is an apocalyptic number.

It is an amenable number.

21033020121 is a deficient number, since it is larger than the sum of its proper divisors (8487008199).

21033020121 is a wasteful number, since it uses less digits than its factorization.

21033020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369000375.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21033020121 its reverse (12102033012), we get a palindrome (33135053133).

The spelling of 21033020121 in words is "twenty-one billion, thirty-three million, twenty thousand, one hundred twenty-one".