210133021 has 12 divisors (see below), whose sum is σ = 244693020. Its totient is φ = 179928000.

The previous prime is 210133019. The next prime is 210133051. The reversal of 210133021 is 120331012.

It can be written as a sum of positive squares in 2 ways, for example, as 56100100 + 154032921 = 7490^2 + 12411^2 .

It is not a de Polignac number, because 210133021 - 2¹ = 210133019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210132992 and 210133010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210133051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68521 + ... + 71521.

It is an arithmetic number, because the mean of its divisors is an integer number (20391085).

Almost surely, 2^210133021 is an apocalyptic number.

It is an amenable number.

210133021 is a deficient number, since it is larger than the sum of its proper divisors (34559999).

210133021 is a wasteful number, since it uses less digits than its factorization.

210133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444 (or 4437 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 210133021 is about 14495.9656801470. The cubic root of 210133021 is about 594.5176713963.

Adding to 210133021 its reverse (120331012), we get a palindrome (330464033).

The spelling of 210133021 in words is "two hundred ten million, one hundred thirty-three thousand, twenty-one".