21376608 has 96 divisors (see below), whose sum is σ = 63286272. Its totient is φ = 6259200.

The previous prime is 21376603. The next prime is 21376613. The reversal of 21376608 is 80667312.

It is an interprime number because it is at equal distance from previous prime (21376603) and next prime (21376613).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32410 + ... + 33062.

It is an arithmetic number, because the mean of its divisors is an integer number (659232).

Almost surely, 2^21376608 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 21376608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31643136).

21376608 is an abundant number, since it is smaller than the sum of its proper divisors (41909664).

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

21376608 is a wasteful number, since it uses less digits than its factorization.

21376608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21376608 is about 4623.4844003197. The cubic root of 21376608 is about 277.5319141933.

The spelling of 21376608 in words is "twenty-one million, three hundred seventy-six thousand, six hundred eight".