21734208 has 84 divisors (see below), whose sum is σ = 63101220. Its totient is φ = 7151616.

The previous prime is 21734203. The next prime is 21734213. The reversal of 21734208 is 80243712.

It is an interprime number because it is at equal distance from previous prime (21734203) and next prime (21734213).

It can be written as a sum of positive squares in 2 ways, for example, as 7354944 + 14379264 = 2712^2 + 3792^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55678 + ... + 56066.

It is an arithmetic number, because the mean of its divisors is an integer number (751205).

Almost surely, 2^21734208 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 21734208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31550610).

21734208 is an abundant number, since it is smaller than the sum of its proper divisors (41367012).

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

21734208 is a wasteful number, since it uses less digits than its factorization.

21734208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21734208 is about 4661.9961389945. The cubic root of 21734208 is about 279.0709342897.

The spelling of 21734208 in words is "twenty-one million, seven hundred thirty-four thousand, two hundred eight".