21330221213 has 24 divisors (see below), whose sum is σ = 24989338080. Its totient is φ = 18153223200.

The previous prime is 21330221191. The next prime is 21330221287. The reversal of 21330221213 is 31212203312.

It is not a de Polignac number, because 21330221213 - 2⁶ = 21330221149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330220213) 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 23 ways as a sum of consecutive naturals, for example, 7480238 + ... + 7483088.

It is an arithmetic number, because the mean of its divisors is an integer number (1041222420).

Almost surely, 2^21330221213 is an apocalyptic number.

It is an amenable number.

21330221213 is a deficient number, since it is larger than the sum of its proper divisors (3659116867).

21330221213 is a wasteful number, since it uses less digits than its factorization.

21330221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897 (or 3890 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21330221213 its reverse (31212203312), we get a palindrome (52542424525).

The spelling of 21330221213 in words is "twenty-one billion, three hundred thirty million, two hundred twenty-one thousand, two hundred thirteen".