21344442141 has 16 divisors (see below), whose sum is σ = 31113538560. Its totient is φ = 12908076720.

The previous prime is 21344442137. The next prime is 21344442173. The reversal of 21344442141 is 14124444312.

It is a happy number.

It is not a de Polignac number, because 21344442141 - 2² = 21344442137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21344442099 and 21344442108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344442241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683211 + ... + 713768.

It is an arithmetic number, because the mean of its divisors is an integer number (1944596160).

Almost surely, 2^21344442141 is an apocalyptic number.

It is an amenable number.

21344442141 is a deficient number, since it is larger than the sum of its proper divisors (9769096419).

21344442141 is a wasteful number, since it uses less digits than its factorization.

21344442141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397456.

The product of its digits is 12288, while the sum is 30.

Adding to 21344442141 its reverse (14124444312), we get a palindrome (35468886453).

The spelling of 21344442141 in words is "twenty-one billion, three hundred forty-four million, four hundred forty-two thousand, one hundred forty-one".