21344444011 has 4 divisors (see below), whose sum is σ = 23284848024. Its totient is φ = 19404040000.

The previous prime is 21344444003. The next prime is 21344444047. The reversal of 21344444011 is 11044444312.

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 21344444011 - 2³ = 21344444003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344444071) 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, 970201990 + ... + 970202011.

It is an arithmetic number, because the mean of its divisors is an integer number (5821212006).

Almost surely, 2^21344444011 is an apocalyptic number.

21344444011 is a deficient number, since it is larger than the sum of its proper divisors (1940404013).

21344444011 is a wasteful number, since it uses less digits than its factorization.

21344444011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940404012.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21344444011 its reverse (11044444312), we get a palindrome (32388888323).

The spelling of 21344444011 in words is "twenty-one billion, three hundred forty-four million, four hundred forty-four thousand, eleven".