21049448 has 32 divisors (see below), whose sum is σ = 46329600. Its totient is φ = 8776512.

The previous prime is 21049387. The next prime is 21049493. The reversal of 21049448 is 84494012.

It is a super-2 number, since 2×21049448² = 886158522209408, which contains 22 as substring.

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, 3008 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (1447800).

Almost surely, 2^21049448 is an apocalyptic number.

21049448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21049448 is an abundant number, since it is smaller than the sum of its proper divisors (25280152).

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

21049448 is a wasteful number, since it uses less digits than its factorization.

21049448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209 (or 10205 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21049448 is about 4587.9677418221. The cubic root of 21049448 is about 276.1087927896.

The spelling of 21049448 in words is "twenty-one million, forty-nine thousand, four hundred forty-eight".