21104061 has 8 divisors (see below), whose sum is σ = 30696864. Its totient is φ = 12790320.

The previous prime is 21104059. The next prime is 21104063. The reversal of 21104061 is 16040112.

It is an interprime number because it is at equal distance from previous prime (21104059) and next prime (21104063).

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

It is not a de Polignac number, because 21104061 - 2¹ = 21104059 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21104061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319726 + ... + 319791.

It is an arithmetic number, because the mean of its divisors is an integer number (3837108).

Almost surely, 2^21104061 is an apocalyptic number.

It is an amenable number.

21104061 is a deficient number, since it is larger than the sum of its proper divisors (9592803).

21104061 is a wasteful number, since it uses less digits than its factorization.

21104061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639531.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21104061 is about 4593.9156500746. The cubic root of 21104061 is about 276.3473755667.

Adding to 21104061 its reverse (16040112), we get a palindrome (37144173).

The spelling of 21104061 in words is "twenty-one million, one hundred four thousand, sixty-one".