104100021 has 12 divisors (see below), whose sum is σ = 150527520. Its totient is φ = 69325800.

The previous prime is 104099969. The next prime is 104100023. The reversal of 104100021 is 120001401.

It is a happy number.

It is not a de Polignac number, because 104100021 - 2⁹ = 104099509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 104099976 and 104100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104100023) 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 11 ways as a sum of consecutive naturals, for example, 3496 + ... + 14846.

It is an arithmetic number, because the mean of its divisors is an integer number (12543960).

Almost surely, 2^104100021 is an apocalyptic number.

It is an amenable number.

104100021 is a deficient number, since it is larger than the sum of its proper divisors (46427499).

104100021 is a wasteful number, since it uses less digits than its factorization.

104100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12376 (or 12373 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 104100021 is about 10202.9417816628. The cubic root of 104100021 is about 470.4176474750.

Adding to 104100021 its reverse (120001401), we get a palindrome (224101422).

The spelling of 104100021 in words is "one hundred four million, one hundred thousand, twenty-one".