21213231111133 has 2 divisors, whose sum is σ = 21213231111134. Its totient is φ = 21213231111132.

The previous prime is 21213231111131. The next prime is 21213231111157. The reversal of 21213231111133 is 33111113231212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19898406542169 + 1314824568964 = 4460763^2 + 1146658^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213231111133 - 2¹ = 21213231111131 is a prime.

Together with 21213231111131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21213231111098 and 21213231111107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213231111131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606615555566 + 10606615555567.

It is an arithmetic number, because the mean of its divisors is an integer number (10606615555567).

Almost surely, 2^{21213231111133} is an apocalyptic number.

It is an amenable number.

21213231111133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213231111133 is an equidigital number, since it uses as much as digits as its factorization.

21213231111133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

Adding to 21213231111133 its reverse (33111113231212), we get a palindrome (54324344342345).

The spelling of 21213231111133 in words is "twenty-one trillion, two hundred thirteen billion, two hundred thirty-one million, one hundred eleven thousand, one hundred thirty-three".