21444113311 has 4 divisors (see below), whose sum is σ = 21445166392. Its totient is φ = 21443060232.

The previous prime is 21444113309. The next prime is 21444113333. The reversal of 21444113311 is 11331144412.

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 21444113311 - 2¹ = 21444113309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444113351) 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, 495381 + ... + 536926.

It is an arithmetic number, because the mean of its divisors is an integer number (5361291598).

Almost surely, 2^21444113311 is an apocalyptic number.

21444113311 is a deficient number, since it is larger than the sum of its proper divisors (1053081).

21444113311 is a wasteful number, since it uses less digits than its factorization.

21444113311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053080.

The product of its digits is 1152, while the sum is 25.

Adding to 21444113311 its reverse (11331144412), we get a palindrome (32775257723).

The spelling of 21444113311 in words is "twenty-one billion, four hundred forty-four million, one hundred thirteen thousand, three hundred eleven".