21063448 has 16 divisors (see below), whose sum is σ = 45136080. Its totient is φ = 9027168.

The previous prime is 21063403. The next prime is 21063451. The reversal of 21063448 is 84436012.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188011 + ... + 188122.

It is an arithmetic number, because the mean of its divisors is an integer number (2821005).

Almost surely, 2^21063448 is an apocalyptic number.

21063448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21063448 is an abundant number, since it is smaller than the sum of its proper divisors (24072632).

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

21063448 is a wasteful number, since it uses less digits than its factorization.

21063448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376146 (or 376142 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21063448 is about 4589.4932182105. The cubic root of 21063448 is about 276.1699925960.

The spelling of 21063448 in words is "twenty-one million, sixty-three thousand, four hundred forty-eight".