21650048 has 64 divisors (see below), whose sum is σ = 50118720. Its totient is φ = 9123840.

The previous prime is 21650021. The next prime is 21650087. The reversal of 21650048 is 84005612.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21649999 and 21650026.

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, 65243 + ... + 65573.

It is an arithmetic number, because the mean of its divisors is an integer number (783105).

Almost surely, 2^21650048 is an apocalyptic number.

21650048 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21650048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25059360).

21650048 is an abundant number, since it is smaller than the sum of its proper divisors (28468672).

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

21650048 is an equidigital number, since it uses as much as digits as its factorization.

21650048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 21650048 is about 4652.9612076612. The cubic root of 21650048 is about 278.7102587676.

The spelling of 21650048 in words is "twenty-one million, six hundred fifty thousand, forty-eight".