21607432 has 48 divisors (see below), whose sum is σ = 51423120. Its totient is φ = 8416800.

The previous prime is 21607409. The next prime is 21607441. The reversal of 21607432 is 23470612.

It is a super-2 number, since 2×21607432² = 933762235269248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21607397 and 21607406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1807 + ... + 6817.

It is an arithmetic number, because the mean of its divisors is an integer number (1071315).

Almost surely, 2^21607432 is an apocalyptic number.

21607432 is a gapful number since it is divisible by the number (22) 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 21607432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25711560).

21607432 is an abundant number, since it is smaller than the sum of its proper divisors (29815688).

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

21607432 is a wasteful number, since it uses less digits than its factorization.

21607432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5042 (or 5031 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21607432 is about 4648.3795025794. The cubic root of 21607432 is about 278.5272673617.

The spelling of 21607432 in words is "twenty-one million, six hundred seven thousand, four hundred thirty-two".