21148383 has 4 divisors (see below), whose sum is σ = 28197848. Its totient is φ = 14098920.

The previous prime is 21148381. The next prime is 21148411. The reversal of 21148383 is 38384112.

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

It is not a de Polignac number, because 21148383 - 2¹ = 21148381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21148383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3524728 + ... + 3524733.

It is an arithmetic number, because the mean of its divisors is an integer number (7049462).

Almost surely, 2^21148383 is an apocalyptic number.

21148383 is a deficient number, since it is larger than the sum of its proper divisors (7049465).

21148383 is an equidigital number, since it uses as much as digits as its factorization.

21148383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049464.

The product of its digits is 4608, while the sum is 30.

The square root of 21148383 is about 4598.7371092508. The cubic root of 21148383 is about 276.5406986102.

The spelling of 21148383 in words is "twenty-one million, one hundred forty-eight thousand, three hundred eighty-three".