21431423109 has 8 divisors (see below), whose sum is σ = 28632042432. Its totient is φ = 14259209600.

The previous prime is 21431423089. The next prime is 21431423131. The reversal of 21431423109 is 90132413412.

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 21431423109 - 2⁵ = 21431423077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431423009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7099692 + ... + 7102709.

It is an arithmetic number, because the mean of its divisors is an integer number (3579005304).

Almost surely, 2^21431423109 is an apocalyptic number.

It is an amenable number.

21431423109 is a deficient number, since it is larger than the sum of its proper divisors (7200619323).

21431423109 is a wasteful number, since it uses less digits than its factorization.

21431423109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14202907.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 21431423109 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, one hundred nine".