21607152 has 80 divisors (see below), whose sum is σ = 64495872. Its totient is φ = 6105600.

The previous prime is 21607151. The next prime is 21607163. The reversal of 21607152 is 25170612.

It is a super-2 number, since 2×21607152² = 933738035102208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607151) 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, 35652 + ... + 36252.

Almost surely, 2^21607152 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 21607152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32247936).

21607152 is an abundant number, since it is smaller than the sum of its proper divisors (42888720).

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

21607152 is a wasteful number, since it uses less digits than its factorization.

21607152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21607152 is about 4648.3493844590. The cubic root of 21607152 is about 278.5260642576.

Adding to 21607152 its reverse (25170612), we get a palindrome (46777764).

The spelling of 21607152 in words is "twenty-one million, six hundred seven thousand, one hundred fifty-two".