21011133313221 has 16 divisors (see below), whose sum is σ = 28729622431488. Its totient is φ = 13652506483200.

The previous prime is 21011133313217. The next prime is 21011133313229. The reversal of 21011133313221 is 12231333111012.

It is not a de Polignac number, because 21011133313221 - 2² = 21011133313217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011133313191 and 21011133313200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011133313229) 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 15 ways as a sum of consecutive naturals, for example, 309126040 + ... + 309194001.

It is an arithmetic number, because the mean of its divisors is an integer number (1795601401968).

Almost surely, 2^{21011133313221} is an apocalyptic number.

It is an amenable number.

21011133313221 is a deficient number, since it is larger than the sum of its proper divisors (7718489118267).

21011133313221 is a wasteful number, since it uses less digits than its factorization.

21011133313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618320332.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21011133313221 its reverse (12231333111012), we get a palindrome (33242466424233).

The spelling of 21011133313221 in words is "twenty-one trillion, eleven billion, one hundred thirty-three million, three hundred thirteen thousand, two hundred twenty-one".