21138483 has 4 divisors (see below), whose sum is σ = 28184648. Its totient is φ = 14092320.

The previous prime is 21138473. The next prime is 21138503. The reversal of 21138483 is 38483112.

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

It is not a de Polignac number, because 21138483 - 2⁵ = 21138451 is a prime.

It is a super-4 number, since 4×21138483⁴ (a number of 30 digits) contains 4444 as substring.

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 21138483.

It is not an unprimeable number, because it can be changed into a prime (21138443) 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, 3523078 + ... + 3523083.

It is an arithmetic number, because the mean of its divisors is an integer number (7046162).

Almost surely, 2^21138483 is an apocalyptic number.

21138483 is a deficient number, since it is larger than the sum of its proper divisors (7046165).

21138483 is an equidigital number, since it uses as much as digits as its factorization.

21138483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046164.

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

The square root of 21138483 is about 4597.6606007838. The cubic root of 21138483 is about 276.4975403819.

The spelling of 21138483 in words is "twenty-one million, one hundred thirty-eight thousand, four hundred eighty-three".