210724148209 has 3 divisors (see below), whose sum is σ = 210724607257. Its totient is φ = 210723689162.

The previous prime is 210724148207. The next prime is 210724148237. The reversal of 210724148209 is 902841427012.

The square root of 210724148209 is 459047.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 210724148209 - 2¹ = 210724148207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210724148207) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 229524 + ... + 688570.

Almost surely, 2^210724148209 is an apocalyptic number.

210724148209 is the 459047-th square number.

210724148209 is the 229524-th centered octagonal number.

It is an amenable number.

210724148209 is a deficient number, since it is larger than the sum of its proper divisors (459048).

210724148209 is an frugal number, since it uses more digits than its factorization.

210724148209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918094 (or 459047 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 210724148209 in words is "two hundred ten billion, seven hundred twenty-four million, one hundred forty-eight thousand, two hundred nine".