21649848 has 32 divisors (see below), whose sum is σ = 59045760. Its totient is φ = 6560480.

The previous prime is 21649819. The next prime is 21649861. The reversal of 21649848 is 84894612.

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, 40740 + ... + 41267.

It is an arithmetic number, because the mean of its divisors is an integer number (1845180).

Almost surely, 2^21649848 is an apocalyptic number.

It is an amenable number.

21649848 is an abundant number, since it is smaller than the sum of its proper divisors (37395912).

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

21649848 is a wasteful number, since it uses less digits than its factorization.

21649848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82027 (or 82023 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 21649848 is about 4652.9397159215. The cubic root of 21649848 is about 278.7094005367.

The spelling of 21649848 in words is "twenty-one million, six hundred forty-nine thousand, eight hundred forty-eight".