21111503033 has 2 divisors, whose sum is σ = 21111503034. Its totient is φ = 21111503032.

The previous prime is 21111502963. The next prime is 21111503081. The reversal of 21111503033 is 33030511112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18831249529 + 2280253504 = 137227^2 + 47752^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111503033 - 2⁸ = 21111502777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111502996 and 21111503014.

It is not a weakly prime, because it can be changed into another prime (21111502033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555751516 + 10555751517.

It is an arithmetic number, because the mean of its divisors is an integer number (10555751517).

Almost surely, 2^21111503033 is an apocalyptic number.

It is an amenable number.

21111503033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111503033 is an equidigital number, since it uses as much as digits as its factorization.

21111503033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The spelling of 21111503033 in words is "twenty-one billion, one hundred eleven million, five hundred three thousand, thirty-three".