210240661 has 8 divisors (see below), whose sum is σ = 216082944. Its totient is φ = 204432480.

The previous prime is 210240647. The next prime is 210240671. The reversal of 210240661 is 166042012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210240661 - 2¹⁷ = 210109589 is a prime.

It is a super-2 number, since 2×210240661² = 88402271075433842, 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 (210240671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4236 + ... + 20938.

It is an arithmetic number, because the mean of its divisors is an integer number (27010368).

Almost surely, 2^210240661 is an apocalyptic number.

It is an amenable number.

210240661 is a deficient number, since it is larger than the sum of its proper divisors (5842283).

210240661 is a wasteful number, since it uses less digits than its factorization.

210240661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17051.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 210240661 is about 14499.6779619411. The cubic root of 210240661 is about 594.6191673568.

Adding to 210240661 its reverse (166042012), we get a palindrome (376282673).

The spelling of 210240661 in words is "two hundred ten million, two hundred forty thousand, six hundred sixty-one".