21111203033 has 2 divisors, whose sum is σ = 21111203034. Its totient is φ = 21111203032.

The previous prime is 21111203023. The next prime is 21111203053. The reversal of 21111203033 is 33030211112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13283023504 + 7828179529 = 115252^2 + 88477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111203033 - 2³⁴ = 3931333849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21111203023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555601516 + 10555601517.

It is an arithmetic number, because the mean of its divisors is an integer number (10555601517).

Almost surely, 2^21111203033 is an apocalyptic number.

It is an amenable number.

21111203033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111203033 is an equidigital number, since it uses as much as digits as its factorization.

21111203033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21111203033 its reverse (33030211112), we get a palindrome (54141414145).

The spelling of 21111203033 in words is "twenty-one billion, one hundred eleven million, two hundred three thousand, thirty-three".