21326344231 has 4 divisors (see below), whose sum is σ = 21420293112. Its totient is φ = 21232395352.

The previous prime is 21326344213. The next prime is 21326344253. The reversal of 21326344231 is 13244362312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21326344231 - 2¹³ = 21326336039 is a prime.

It is a super-2 number, since 2×21326344231² (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 = 21326344193 and 21326344202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326344031) 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 3 ways as a sum of consecutive naturals, for example, 46974100 + ... + 46974553.

It is an arithmetic number, because the mean of its divisors is an integer number (5355073278).

Almost surely, 2^21326344231 is an apocalyptic number.

21326344231 is a deficient number, since it is larger than the sum of its proper divisors (93948881).

21326344231 is an equidigital number, since it uses as much as digits as its factorization.

21326344231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93948880.

The product of its digits is 20736, while the sum is 31.

The spelling of 21326344231 in words is "twenty-one billion, three hundred twenty-six million, three hundred forty-four thousand, two hundred thirty-one".