21437104 has 40 divisors (see below), whose sum is σ = 46684512. Its totient is φ = 9461760.

The previous prime is 21437099. The next prime is 21437113. The reversal of 21437104 is 40173412.

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 in 7 ways as a sum of consecutive naturals, for example, 2544 + ... + 7024.

Almost surely, 2^21437104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21437104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23342256).

21437104 is an abundant number, since it is smaller than the sum of its proper divisors (25247408).

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

21437104 is a wasteful number, since it uses less digits than its factorization.

21437104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525 (or 4519 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21437104 is about 4630.0220301852. The cubic root of 21437104 is about 277.7934735783.

The spelling of 21437104 in words is "twenty-one million, four hundred thirty-seven thousand, one hundred four".