21944444133 has 4 divisors (see below), whose sum is σ = 29259258848. Its totient is φ = 14629629420.

The previous prime is 21944444107. The next prime is 21944444153. The reversal of 21944444133 is 33144444912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21944444133 - 2⁸ = 21944443877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21944444091 and 21944444100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944444153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3657407353 + ... + 3657407358.

It is an arithmetic number, because the mean of its divisors is an integer number (7314814712).

Almost surely, 2^21944444133 is an apocalyptic number.

It is an amenable number.

21944444133 is a deficient number, since it is larger than the sum of its proper divisors (7314814715).

21944444133 is an equidigital number, since it uses as much as digits as its factorization.

21944444133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314814714.

The product of its digits is 165888, while the sum is 39.

The spelling of 21944444133 in words is "twenty-one billion, nine hundred forty-four million, four hundred forty-four thousand, one hundred thirty-three".