210223661 has 8 divisors (see below), whose sum is σ = 213857280. Its totient is φ = 206614512.

The previous prime is 210223631. The next prime is 210223681. The reversal of 210223661 is 166322012.

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 210223661 - 2⁶ = 210223597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210223631) 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 7 ways as a sum of consecutive naturals, for example, 11651 + ... + 23583.

It is an arithmetic number, because the mean of its divisors is an integer number (26732160).

Almost surely, 2^210223661 is an apocalyptic number.

It is an amenable number.

210223661 is a deficient number, since it is larger than the sum of its proper divisors (3633619).

210223661 is a wasteful number, since it uses less digits than its factorization.

210223661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12235.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 210223661 is about 14499.0917301740. The cubic root of 210223661 is about 594.6031400126.

Adding to 210223661 its reverse (166322012), we get a palindrome (376545673).

The spelling of 210223661 in words is "two hundred ten million, two hundred twenty-three thousand, six hundred sixty-one".