121866206 has 64 divisors (see below), whose sum is σ = 236390400. Its totient is φ = 45749760.

The previous prime is 121866203. The next prime is 121866281. The reversal of 121866206 is 602668121.

121866206 = 204² + 205² + ... + 720².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121866203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 817820 + ... + 817968.

It is an arithmetic number, because the mean of its divisors is an integer number (3693600).

Almost surely, 2^121866206 is an apocalyptic number.

121866206 is a deficient number, since it is larger than the sum of its proper divisors (114524194).

121866206 is a wasteful number, since it uses less digits than its factorization.

121866206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 121866206 is about 11039.3027859553. The cubic root of 121866206 is about 495.7861954639.

The spelling of 121866206 in words is "one hundred twenty-one million, eight hundred sixty-six thousand, two hundred six".