213250666 has 16 divisors (see below), whose sum is σ = 325490184. Its totient is φ = 104765184.

The previous prime is 213250651. The next prime is 213250673. The reversal of 213250666 is 666052312.

It can be written as a sum of positive squares in 4 ways, for example, as 156775441 + 56475225 = 12521^2 + 7515^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37806 + ... + 43078.

Almost surely, 2^213250666 is an apocalyptic number.

213250666 is a deficient number, since it is larger than the sum of its proper divisors (112239518).

213250666 is a wasteful number, since it uses less digits than its factorization.

213250666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5625.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 213250666 is about 14603.1046698981. The cubic root of 213250666 is about 597.4434425321.

The spelling of 213250666 in words is "two hundred thirteen million, two hundred fifty thousand, six hundred sixty-six".