21116104 has 8 divisors (see below), whose sum is σ = 39592710. Its totient is φ = 10558048.

The previous prime is 21116099. The next prime is 21116119. The reversal of 21116104 is 40161112.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 2883204 = 4270^2 + 1698^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319749 + ... + 1319764.

Almost surely, 2^21116104 is an apocalyptic number.

It is an amenable number.

21116104 is a deficient number, since it is larger than the sum of its proper divisors (18476606).

21116104 is a wasteful number, since it uses less digits than its factorization.

21116104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639519 (or 2639515 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21116104 is about 4595.2262185882. The cubic root of 21116104 is about 276.3999313062.

Adding to 21116104 its reverse (40161112), we get a palindrome (61277216).

The spelling of 21116104 in words is "twenty-one million, one hundred sixteen thousand, one hundred four".