221906033 has 2 divisors, whose sum is σ = 221906034. Its totient is φ = 221906032.

The previous prime is 221906011. The next prime is 221906051. The reversal of 221906033 is 330609122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113891584 + 108014449 = 10672^2 + 10393^2 .

It is a cyclic number.

It is not a de Polignac number, because 221906033 - 2⁶ = 221905969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221905993 and 221906011.

It is not a weakly prime, because it can be changed into another prime (221906053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110953016 + 110953017.

It is an arithmetic number, because the mean of its divisors is an integer number (110953017).

Almost surely, 2^221906033 is an apocalyptic number.

It is an amenable number.

221906033 is a deficient number, since it is larger than the sum of its proper divisors (1).

221906033 is an equidigital number, since it uses as much as digits as its factorization.

221906033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 221906033 is about 14896.5107659478. The cubic root of 221906033 is about 605.4194509453.

The spelling of 221906033 in words is "two hundred twenty-one million, nine hundred six thousand, thirty-three".