16866121 has 8 divisors (see below), whose sum is σ = 17236800. Its totient is φ = 16499280.

The previous prime is 16866103. The next prime is 16866127. The reversal of 16866121 is 12166861.

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 16866121 - 2¹¹ = 16864073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16866127) 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, 9015 + ... + 10723.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^16866121 is an apocalyptic number.

It is an amenable number.

16866121 is a deficient number, since it is larger than the sum of its proper divisors (370679).

16866121 is a wasteful number, since it uses less digits than its factorization.

16866121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919.

The product of its digits is 3456, while the sum is 31.

The square root of 16866121 is about 4106.8383216289. The cubic root of 16866121 is about 256.4513978086.

The spelling of 16866121 in words is "sixteen million, eight hundred sixty-six thousand, one hundred twenty-one".