21734080 has 56 divisors (see below), whose sum is σ = 54022752. Its totient is φ = 8312832.

The previous prime is 21734077. The next prime is 21734099. The reversal of 21734080 is 8043712.

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, 5884 + ... + 8836.

It is an arithmetic number, because the mean of its divisors is an integer number (964692).

Almost surely, 2^21734080 is an apocalyptic number.

21734080 is a gapful number since it is divisible by the number (20) 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 21734080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27011376).

21734080 is an abundant number, since it is smaller than the sum of its proper divisors (32288672).

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

21734080 is a wasteful number, since it uses less digits than its factorization.

21734080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993 (or 2983 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21734080 is about 4661.9824109492. The cubic root of 21734080 is about 279.0703864413.

Adding to 21734080 its reverse (8043712), we get a palindrome (29777792).

The spelling of 21734080 in words is "twenty-one million, seven hundred thirty-four thousand, eighty".