21310111033 has 2 divisors, whose sum is σ = 21310111034. Its totient is φ = 21310111032.

The previous prime is 21310111001. The next prime is 21310111037. The reversal of 21310111033 is 33011101312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20188999744 + 1121111289 = 142088^2 + 33483^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310111033 - 2⁵ = 21310111001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310110998 and 21310111016.

It is not a weakly prime, because it can be changed into another prime (21310111037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655055516 + 10655055517.

It is an arithmetic number, because the mean of its divisors is an integer number (10655055517).

Almost surely, 2^21310111033 is an apocalyptic number.

It is an amenable number.

21310111033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310111033 is an equidigital number, since it uses as much as digits as its factorization.

21310111033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21310111033 its reverse (33011101312), we get a palindrome (54321212345).

The spelling of 21310111033 in words is "twenty-one billion, three hundred ten million, one hundred eleven thousand, thirty-three".