21033031221133 has 2 divisors, whose sum is σ = 21033031221134. Its totient is φ = 21033031221132.

The previous prime is 21033031221091. The next prime is 21033031221211. The reversal of 21033031221133 is 33112213033012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16631372672964 + 4401658548169 = 4078158^2 + 2098013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033031221133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033031221098 and 21033031221107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033031281133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516515610566 + 10516515610567.

It is an arithmetic number, because the mean of its divisors is an integer number (10516515610567).

Almost surely, 2^{21033031221133} is an apocalyptic number.

It is an amenable number.

21033031221133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033031221133 is an equidigital number, since it uses as much as digits as its factorization.

21033031221133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21033031221133 its reverse (33112213033012), we get a palindrome (54145244254145).

The spelling of 21033031221133 in words is "twenty-one trillion, thirty-three billion, thirty-one million, two hundred twenty-one thousand, one hundred thirty-three".