21212113113321 has 24 divisors (see below), whose sum is σ = 30849318666720. Its totient is φ = 12958326216576.

The previous prime is 21212113113311. The next prime is 21212113113343. The reversal of 21212113113321 is 12331131121212.

It is not a de Polignac number, because 21212113113321 - 2²¹ = 21212111016169 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21212113113291 and 21212113113300.

It is not an unprimeable number, because it can be changed into a prime (21212113113311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152625751 + ... + 152764668.

It is an arithmetic number, because the mean of its divisors is an integer number (1285388277780).

Almost surely, 2^{21212113113321} is an apocalyptic number.

It is an amenable number.

21212113113321 is a deficient number, since it is larger than the sum of its proper divisors (9637205553399).

21212113113321 is a wasteful number, since it uses less digits than its factorization.

21212113113321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305390585 (or 305390572 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

Adding to 21212113113321 its reverse (12331131121212), we get a palindrome (33543244234533).

The spelling of 21212113113321 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred thirteen thousand, three hundred twenty-one".