21801248 has 24 divisors (see below), whose sum is σ = 49053312. Its totient is φ = 9343296.

The previous prime is 21801211. The next prime is 21801271. The reversal of 21801248 is 84210812.

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, 48440 + ... + 48887.

It is an arithmetic number, because the mean of its divisors is an integer number (2043888).

Almost surely, 2^21801248 is an apocalyptic number.

21801248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21801248 is an abundant number, since it is smaller than the sum of its proper divisors (27252064).

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

21801248 is an equidigital number, since it uses as much as digits as its factorization.

21801248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97344 (or 97336 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 21801248 is about 4669.1806561751. The cubic root of 21801248 is about 279.3575747815.

The spelling of 21801248 in words is "twenty-one million, eight hundred one thousand, two hundred forty-eight".