21489104 has 40 divisors (see below), whose sum is σ = 51246720. Its totient is φ = 8500608.

The previous prime is 21489101. The next prime is 21489137. The reversal of 21489104 is 40198412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489101) 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, 5924 + ... + 8835.

It is an arithmetic number, because the mean of its divisors is an integer number (1281168).

Almost surely, 2^21489104 is an apocalyptic number.

It is an amenable number.

21489104 is an abundant number, since it is smaller than the sum of its proper divisors (29757616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21489104 is a wasteful number, since it uses less digits than its factorization.

21489104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787 (or 14781 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 21489104 is about 4635.6341529504. The cubic root of 21489104 is about 278.0179068223.

The spelling of 21489104 in words is "twenty-one million, four hundred eighty-nine thousand, one hundred four".