21103650166 has 32 divisors (see below), whose sum is σ = 32578571520. Its totient is φ = 10247144544.

The previous prime is 21103650149. The next prime is 21103650259. The reversal of 21103650166 is 66105630112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17255031 + ... + 17256253.

It is an arithmetic number, because the mean of its divisors is an integer number (1018080360).

Almost surely, 2^21103650166 is an apocalyptic number.

21103650166 is a deficient number, since it is larger than the sum of its proper divisors (11474921354).

21103650166 is a wasteful number, since it uses less digits than its factorization.

21103650166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 21103650166 in words is "twenty-one billion, one hundred three million, six hundred fifty thousand, one hundred sixty-six".