210021273 has 36 divisors (see below), whose sum is σ = 381099264. Its totient is φ = 109098000.

The previous prime is 210021271. The next prime is 210021283. The reversal of 210021273 is 372120012.

It is not a de Polignac number, because 210021273 - 2¹ = 210021271 is a prime.

It is a super-2 number, since 2×210021273² = 88217870225081058, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210021271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6153 + ... + 21398.

Almost surely, 2^210021273 is an apocalyptic number.

It is an amenable number.

210021273 is a deficient number, since it is larger than the sum of its proper divisors (171077991).

210021273 is a wasteful number, since it uses less digits than its factorization.

210021273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27586 (or 27572 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 210021273 is about 14492.1107158343. The cubic root of 210021273 is about 594.4122652418.

Adding to 210021273 its reverse (372120012), we get a palindrome (582141285).

The spelling of 210021273 in words is "two hundred ten million, twenty-one thousand, two hundred seventy-three".