21148983 has 24 divisors (see below), whose sum is σ = 32348160. Its totient is φ = 13287120.

The previous prime is 21148979. The next prime is 21149021. The reversal of 21148983 is 38984112.

It is not a de Polignac number, because 21148983 - 2² = 21148979 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (13824) is a multiple of the sum of its prime divisors (1536).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13978 + ... + 15416.

It is an arithmetic number, because the mean of its divisors is an integer number (1347840).

Almost surely, 2^21148983 is an apocalyptic number.

21148983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21148983 is a deficient number, since it is larger than the sum of its proper divisors (11199177).

21148983 is a wasteful number, since it uses less digits than its factorization.

21148983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539 (or 1536 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 21148983 is about 4598.8023440892. The cubic root of 21148983 is about 276.5433138275.

It can be divided in two parts, 211 and 48983, that added together give a palindrome (49194).

The spelling of 21148983 in words is "twenty-one million, one hundred forty-eight thousand, nine hundred eighty-three".