21448032 has 48 divisors (see below), whose sum is σ = 58125312. Its totient is φ = 6917760.

The previous prime is 21448003. The next prime is 21448051. The reversal of 21448032 is 23084412.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a junction number, because it is equal to n+sod(n) for n = 21447993 and 21448011.

It is a congruent number.

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, 628 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (1210944).

Almost surely, 2^21448032 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 21448032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29062656).

21448032 is an abundant number, since it is smaller than the sum of its proper divisors (36677280).

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

21448032 is a wasteful number, since it uses less digits than its factorization.

21448032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251 (or 7243 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 21448032 is about 4631.2020037999. The cubic root of 21448032 is about 277.8406691849.

The spelling of 21448032 in words is "twenty-one million, four hundred forty-eight thousand, thirty-two".