21438097109 has 8 divisors (see below), whose sum is σ = 25186016352. Its totient is φ = 17990011440.

The previous prime is 21438097091. The next prime is 21438097123. The reversal of 21438097109 is 90179083412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21438097109 - 2²⁴ = 21421319893 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 21438097109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438097139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74958239 + ... + 74958524.

It is an arithmetic number, because the mean of its divisors is an integer number (3148252044).

Almost surely, 2^21438097109 is an apocalyptic number.

It is an amenable number.

21438097109 is a deficient number, since it is larger than the sum of its proper divisors (3747919243).

21438097109 is a wasteful number, since it uses less digits than its factorization.

21438097109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149916787.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 21438097109 in words is "twenty-one billion, four hundred thirty-eight million, ninety-seven thousand, one hundred nine".