100821866 has 16 divisors (see below), whose sum is σ = 168557760. Its totient is φ = 44948160.

The previous prime is 100821841. The next prime is 100821869. The reversal of 100821866 is 668128001.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100821869) 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, 77390 + ... + 78681.

It is an arithmetic number, because the mean of its divisors is an integer number (10534860).

Almost surely, 2^100821866 is an apocalyptic number.

100821866 is a deficient number, since it is larger than the sum of its proper divisors (67735894).

100821866 is a wasteful number, since it uses less digits than its factorization.

100821866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156109.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 100821866 is about 10041.0092122256. The cubic root of 100821866 is about 465.4270036133.

Adding to 100821866 its reverse (668128001), we get a palindrome (768949867).

The spelling of 100821866 in words is "one hundred million, eight hundred twenty-one thousand, eight hundred sixty-six".