100821623 has 8 divisors (see below), whose sum is σ = 115330848. Its totient is φ = 86338944.

The previous prime is 100821613. The next prime is 100821647. The reversal of 100821623 is 326128001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100821623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100821613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315 + ... + 14387.

It is an arithmetic number, because the mean of its divisors is an integer number (14416356).

Almost surely, 2^100821623 is an apocalyptic number.

100821623 is a deficient number, since it is larger than the sum of its proper divisors (14509225).

100821623 is a wasteful number, since it uses less digits than its factorization.

100821623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13273.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 100821623 is about 10040.9971118410. The cubic root of 100821623 is about 465.4266296903.

Adding to 100821623 its reverse (326128001), we get a palindrome (426949624).

The spelling of 100821623 in words is "one hundred million, eight hundred twenty-one thousand, six hundred twenty-three".