21113301331221 has 48 divisors (see below), whose sum is σ = 31872669709824. Its totient is φ = 12328612332000.

The previous prime is 21113301331219. The next prime is 21113301331247. The reversal of 21113301331221 is 12213310331112.

It is not a de Polignac number, because 21113301331221 - 2¹ = 21113301331219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21113301331191 and 21113301331200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113301338221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5732416 + ... + 8665286.

It is an arithmetic number, because the mean of its divisors is an integer number (664013952288).

Almost surely, 2^{21113301331221} is an apocalyptic number.

It is an amenable number.

21113301331221 is a deficient number, since it is larger than the sum of its proper divisors (10759368378603).

21113301331221 is a wasteful number, since it uses less digits than its factorization.

21113301331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933174 (or 2933143 counting only the distinct ones).

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

Adding to 21113301331221 its reverse (12213310331112), we get a palindrome (33326611662333).

The spelling of 21113301331221 in words is "twenty-one trillion, one hundred thirteen billion, three hundred one million, three hundred thirty-one thousand, two hundred twenty-one".