213101666 has 16 divisors (see below), whose sum is σ = 327089664. Its totient is φ = 104080704.

The previous prime is 213101653. The next prime is 213101677. The reversal of 213101666 is 666101312.

213101666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 53831 + ... + 57653.

It is an arithmetic number, because the mean of its divisors is an integer number (20443104).

Almost surely, 2^213101666 is an apocalyptic number.

213101666 is a deficient number, since it is larger than the sum of its proper divisors (113987998).

213101666 is a wasteful number, since it uses less digits than its factorization.

213101666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 213101666 is about 14598.0021235784. The cubic root of 213101666 is about 597.3042638909.

Adding to 213101666 its reverse (666101312), we get a palindrome (879202978).

The spelling of 213101666 in words is "two hundred thirteen million, one hundred one thousand, six hundred sixty-six".