210666242 has 4 divisors (see below), whose sum is σ = 315999366. Its totient is φ = 105333120.

The previous prime is 210666229. The next prime is 210666257. The reversal of 210666242 is 242666012.

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

It can be written as a sum of positive squares in only one way, i.e., 187443481 + 23222761 = 13691^2 + 4819^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52666559 + ... + 52666562.

Almost surely, 2^210666242 is an apocalyptic number.

210666242 is a deficient number, since it is larger than the sum of its proper divisors (105333124).

210666242 is a wasteful number, since it uses less digits than its factorization.

210666242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105333123.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 210666242 is about 14514.3460755213. The cubic root of 210666242 is about 595.0201174847.

The spelling of 210666242 in words is "two hundred ten million, six hundred sixty-six thousand, two hundred forty-two".