210533993 has 2 divisors, whose sum is σ = 210533994. Its totient is φ = 210533992.

The previous prime is 210533969. The next prime is 210534011. The reversal of 210533993 is 399335012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120055849 + 90478144 = 10957^2 + 9512^2 .

It is a cyclic number.

It is not a de Polignac number, because 210533993 - 2⁶ = 210533929 is a prime.

It is not a weakly prime, because it can be changed into another prime (210533903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105266996 + 105266997.

It is an arithmetic number, because the mean of its divisors is an integer number (105266997).

Almost surely, 2^210533993 is an apocalyptic number.

It is an amenable number.

210533993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210533993 is an equidigital number, since it uses as much as digits as its factorization.

210533993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 35.

The square root of 210533993 is about 14509.7895573988. The cubic root of 210533993 is about 594.8955803860.

The spelling of 210533993 in words is "two hundred ten million, five hundred thirty-three thousand, nine hundred ninety-three".