21438006182 has 4 divisors (see below), whose sum is σ = 32157009276. Its totient is φ = 10719003090.

The previous prime is 21438006113. The next prime is 21438006253. The reversal of 21438006182 is 28160083412.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5359501544 + ... + 5359501547.

It is an arithmetic number, because the mean of its divisors is an integer number (8039252319).

Almost surely, 2^21438006182 is an apocalyptic number.

21438006182 is a deficient number, since it is larger than the sum of its proper divisors (10719003094).

21438006182 is a wasteful number, since it uses less digits than its factorization.

21438006182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10719003093.

The product of its (nonzero) digits is 18432, while the sum is 35.

Adding to 21438006182 its reverse (28160083412), we get a palindrome (49598089594).

The spelling of 21438006182 in words is "twenty-one billion, four hundred thirty-eight million, six thousand, one hundred eighty-two".