21542104 has 8 divisors (see below), whose sum is σ = 40391460. Its totient is φ = 10771048.

The previous prime is 21542093. The next prime is 21542119. The reversal of 21542104 is 40124512.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1346374 + ... + 1346389.

Almost surely, 2^21542104 is an apocalyptic number.

It is an amenable number.

21542104 is a deficient number, since it is larger than the sum of its proper divisors (18849356).

21542104 is a wasteful number, since it uses less digits than its factorization.

21542104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692769 (or 2692765 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21542104 is about 4641.3472182115. The cubic root of 21542104 is about 278.2462838284.

Adding to 21542104 its reverse (40124512), we get a palindrome (61666616).

The spelling of 21542104 in words is "twenty-one million, five hundred forty-two thousand, one hundred four".