21404112231 has 8 divisors (see below), whose sum is σ = 28663440880. Its totient is φ = 14207095872.

The previous prime is 21404112181. The next prime is 21404112281. The reversal of 21404112231 is 13221140412.

It is an interprime number because it is at equal distance from previous prime (21404112181) and next prime (21404112281).

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

It is not a de Polignac number, because 21404112231 - 2⁶ = 21404112167 is a prime.

It is a super-2 number, since 2×21404112231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21404112198 and 21404112207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404112281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15577270 + ... + 15578643.

It is an arithmetic number, because the mean of its divisors is an integer number (3582930110).

Almost surely, 2^21404112231 is an apocalyptic number.

21404112231 is a deficient number, since it is larger than the sum of its proper divisors (7259328649).

21404112231 is a wasteful number, since it uses less digits than its factorization.

21404112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31156145.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21404112231 its reverse (13221140412), we get a palindrome (34625252643).

The spelling of 21404112231 in words is "twenty-one billion, four hundred four million, one hundred twelve thousand, two hundred thirty-one".