210066397 has 4 divisors (see below), whose sum is σ = 210104316. Its totient is φ = 210028480.

The previous prime is 210066379. The next prime is 210066449. The reversal of 210066397 is 793660012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43811161 + 166255236 = 6619^2 + 12894^2 .

It is a cyclic number.

It is not a de Polignac number, because 210066397 - 2²³ = 201677789 is a prime.

It is a super-2 number, since 2×210066397² = 88255782297123218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210066317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8854 + ... + 22327.

It is an arithmetic number, because the mean of its divisors is an integer number (52526079).

Almost surely, 2^210066397 is an apocalyptic number.

It is an amenable number.

210066397 is a deficient number, since it is larger than the sum of its proper divisors (37919).

210066397 is an equidigital number, since it uses as much as digits as its factorization.

210066397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37918.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 210066397 is about 14493.6674792821. The cubic root of 210066397 is about 594.4548328953.

The spelling of 210066397 in words is "two hundred ten million, sixty-six thousand, three hundred ninety-seven".