21344121444 has 24 divisors (see below), whose sum is σ = 49924729120. Its totient is φ = 7097310144.

The previous prime is 21344121419. The next prime is 21344121467. The reversal of 21344121444 is 44412144312.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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, 2169514 + ... + 2179329.

Almost surely, 2^21344121444 is an apocalyptic number.

It is an amenable number.

21344121444 is an abundant number, since it is smaller than the sum of its proper divisors (28580607676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344121444 is a wasteful number, since it uses less digits than its factorization.

21344121444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4349259 (or 4349257 counting only the distinct ones).

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

Adding to 21344121444 its reverse (44412144312), we get a palindrome (65756265756).

The spelling of 21344121444 in words is "twenty-one billion, three hundred forty-four million, one hundred twenty-one thousand, four hundred forty-four".