210681973 has 4 divisors (see below), whose sum is σ = 211067680. Its totient is φ = 210296268.

The previous prime is 210681967. The next prime is 210681997. The reversal of 210681973 is 379186012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210681973 - 2⁵ = 210681941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210681773) 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 3 ways as a sum of consecutive naturals, for example, 192033 + ... + 193126.

It is an arithmetic number, because the mean of its divisors is an integer number (52766920).

Almost surely, 2^210681973 is an apocalyptic number.

It is an amenable number.

210681973 is a deficient number, since it is larger than the sum of its proper divisors (385707).

210681973 is an equidigital number, since it uses as much as digits as its factorization.

210681973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385706.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 210681973 is about 14514.8879775216. The cubic root of 210681973 is about 595.0349276862.

The spelling of 210681973 in words is "two hundred ten million, six hundred eighty-one thousand, nine hundred seventy-three".