21448536 has 32 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 7110560.

The previous prime is 21448523. The next prime is 21448561. The reversal of 21448536 is 63584412.

It is a junction number, because it is equal to n+sod(n) for n = 21448497 and 21448506.

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, 2245 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (1684800).

Almost surely, 2^21448536 is an apocalyptic number.

It is an amenable number.

21448536 is an abundant number, since it is smaller than the sum of its proper divisors (32465064).

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

21448536 is a wasteful number, since it uses less digits than its factorization.

21448536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879 (or 4875 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 21448536 is about 4631.2564169996. The cubic root of 21448536 is about 277.8428454623.

The spelling of 21448536 in words is "twenty-one million, four hundred forty-eight thousand, five hundred thirty-six".