21478138119 has 10 divisors (see below), whose sum is σ = 32084626200. Its totient is φ = 14318758692.

The previous prime is 21478138091. The next prime is 21478138211. The reversal of 21478138119 is 91183187412.

It is a happy number.

It is not a de Polignac number, because 21478138119 - 2²⁴ = 21461360903 is a prime.

It is a super-2 number, since 2×21478138119² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478138519) 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 9 ways as a sum of consecutive naturals, for example, 132581019 + ... + 132581180.

It is an arithmetic number, because the mean of its divisors is an integer number (3208462620).

Almost surely, 2^21478138119 is an apocalyptic number.

21478138119 is a deficient number, since it is larger than the sum of its proper divisors (10606488081).

21478138119 is an equidigital number, since it uses as much as digits as its factorization.

21478138119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265162211 (or 265162202 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The spelling of 21478138119 in words is "twenty-one billion, four hundred seventy-eight million, one hundred thirty-eight thousand, one hundred nineteen".