21211012033 has 2 divisors, whose sum is σ = 21211012034. Its totient is φ = 21211012032.

The previous prime is 21211011973. The next prime is 21211012073. The reversal of 21211012033 is 33021011212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21131855424 + 79156609 = 145368^2 + 8897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211012033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211011998 and 21211012016.

It is not a weakly prime, because it can be changed into another prime (21211012073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605506016 + 10605506017.

It is an arithmetic number, because the mean of its divisors is an integer number (10605506017).

Almost surely, 2^21211012033 is an apocalyptic number.

It is an amenable number.

21211012033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211012033 is an equidigital number, since it uses as much as digits as its factorization.

21211012033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21211012033 its reverse (33021011212), we get a palindrome (54232023245).

The spelling of 21211012033 in words is "twenty-one billion, two hundred eleven million, twelve thousand, thirty-three".