21848388 has 12 divisors (see below), whose sum is σ = 50979600. Its totient is φ = 7282792.

The previous prime is 21848369. The next prime is 21848401. The reversal of 21848388 is 88384812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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, 910338 + ... + 910361.

It is an arithmetic number, because the mean of its divisors is an integer number (4248300).

Almost surely, 2^21848388 is an apocalyptic number.

It is an amenable number.

21848388 is an abundant number, since it is smaller than the sum of its proper divisors (29131212).

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

21848388 is a wasteful number, since it uses less digits than its factorization.

21848388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820706 (or 1820704 counting only the distinct ones).

The product of its digits is 98304, while the sum is 42.

The square root of 21848388 is about 4674.2259252201. The cubic root of 21848388 is about 279.5587778795.

The spelling of 21848388 in words is "twenty-one million, eight hundred forty-eight thousand, three hundred eighty-eight".