21432444442131 has 4 divisors (see below), whose sum is σ = 28576592589512. Its totient is φ = 14288296294752.

The previous prime is 21432444442117. The next prime is 21432444442133. The reversal of 21432444442131 is 13124444423412.

It is a happy number.

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

It is not a de Polignac number, because 21432444442131 - 2¹⁴ = 21432444425747 is a prime.

It is a super-2 number, since 2×21432444442131² (a number of 27 digits) contains 22 as substring.

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 21432444442131.

It is not an unprimeable number, because it can be changed into a prime (21432444442133) 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 3 ways as a sum of consecutive naturals, for example, 3572074073686 + ... + 3572074073691.

It is an arithmetic number, because the mean of its divisors is an integer number (7144148147378).

Almost surely, 2^{21432444442131} is an apocalyptic number.

21432444442131 is a deficient number, since it is larger than the sum of its proper divisors (7144148147381).

21432444442131 is an equidigital number, since it uses as much as digits as its factorization.

21432444442131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144148147380.

The product of its digits is 294912, while the sum is 39.

Adding to 21432444442131 its reverse (13124444423412), we get a palindrome (34556888865543).

The spelling of 21432444442131 in words is "twenty-one trillion, four hundred thirty-two billion, four hundred forty-four million, four hundred forty-two thousand, one hundred thirty-one".