21031311102233 has 2 divisors, whose sum is σ = 21031311102234. Its totient is φ = 21031311102232.

The previous prime is 21031311102223. The next prime is 21031311102257. The reversal of 21031311102233 is 33220111313012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12903412305424 + 8127898796809 = 3592132^2 + 2850947^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031311102233 - 2¹⁰ = 21031311101209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21031311102199 and 21031311102208.

It is not a weakly prime, because it can be changed into another prime (21031311102203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515655551116 + 10515655551117.

It is an arithmetic number, because the mean of its divisors is an integer number (10515655551117).

Almost surely, 2^{21031311102233} is an apocalyptic number.

It is an amenable number.

21031311102233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031311102233 is an equidigital number, since it uses as much as digits as its factorization.

21031311102233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21031311102233 its reverse (33220111313012), we get a palindrome (54251422415245).

The spelling of 21031311102233 in words is "twenty-one trillion, thirty-one billion, three hundred eleven million, one hundred two thousand, two hundred thirty-three".