100102821 has 16 divisors (see below), whose sum is σ = 164271744. Its totient is φ = 52801344.

The previous prime is 100102801. The next prime is 100102837. The reversal of 100102821 is 128201001.

It is not a de Polignac number, because 100102821 - 2¹¹ = 100100773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100102821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100102801) by changing a digit.

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, 183066 + ... + 183611.

It is an arithmetic number, because the mean of its divisors is an integer number (10266984).

Almost surely, 2^100102821 is an apocalyptic number.

It is an amenable number.

100102821 is a deficient number, since it is larger than the sum of its proper divisors (64168923).

100102821 is a wasteful number, since it uses less digits than its factorization.

100102821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366700.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 100102821 is about 10005.1397291592. The cubic root of 100102821 is about 464.3179131369.

Adding to 100102821 its reverse (128201001), we get a palindrome (228303822).

The spelling of 100102821 in words is "one hundred million, one hundred two thousand, eight hundred twenty-one".