21848387 has 4 divisors (see below), whose sum is σ = 23834616. Its totient is φ = 19862160.

The previous prime is 21848369. The next prime is 21848401. The reversal of 21848387 is 78384812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21848387 - 2¹⁶ = 21782851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21848327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993098 + ... + 993119.

It is an arithmetic number, because the mean of its divisors is an integer number (5958654).

Almost surely, 2^21848387 is an apocalyptic number.

21848387 is a deficient number, since it is larger than the sum of its proper divisors (1986229).

21848387 is a wasteful number, since it uses less digits than its factorization.

21848387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986228.

The product of its digits is 86016, while the sum is 41.

The square root of 21848387 is about 4674.2258182505. The cubic root of 21848387 is about 279.5587736143.

The spelling of 21848387 in words is "twenty-one million, eight hundred forty-eight thousand, three hundred eighty-seven".