21738496 has 88 divisors (see below), whose sum is σ = 49521024. Its totient is φ = 9461760.

The previous prime is 21738481. The next prime is 21738503. The reversal of 21738496 is 69483712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306141 + ... + 306211.

Almost surely, 2^21738496 is an apocalyptic number.

21738496 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21738496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24760512).

21738496 is an abundant number, since it is smaller than the sum of its proper divisors (27782528).

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

21738496 is a wasteful number, since it uses less digits than its factorization.

21738496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 109 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 21738496 is about 4662.4560051544. The cubic root of 21738496 is about 279.0892859664.

The spelling of 21738496 in words is "twenty-one million, seven hundred thirty-eight thousand, four hundred ninety-six".