21330213121 has 16 divisors (see below), whose sum is σ = 25210405888. Its totient is φ = 17660462400.

The previous prime is 21330213119. The next prime is 21330213193. The reversal of 21330213121 is 12131203312.

It is not a de Polignac number, because 21330213121 - 2¹ = 21330213119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330213101) 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, 26551 + ... + 208243.

It is an arithmetic number, because the mean of its divisors is an integer number (1575650368).

Almost surely, 2^21330213121 is an apocalyptic number.

It is an amenable number.

21330213121 is a deficient number, since it is larger than the sum of its proper divisors (3880192767).

21330213121 is a wasteful number, since it uses less digits than its factorization.

21330213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182272.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21330213121 its reverse (12131203312), we get a palindrome (33461416433).

The spelling of 21330213121 in words is "twenty-one billion, three hundred thirty million, two hundred thirteen thousand, one hundred twenty-one".