21414444511 has 4 divisors (see below), whose sum is σ = 21438587952. Its totient is φ = 21390301072.

The previous prime is 21414444497. The next prime is 21414444521. The reversal of 21414444511 is 11544441412.

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 21414444511 - 2¹⁹ = 21413920223 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 (21414444521) 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, 12070390 + ... + 12072163.

It is an arithmetic number, because the mean of its divisors is an integer number (5359646988).

Almost surely, 2^21414444511 is an apocalyptic number.

21414444511 is a deficient number, since it is larger than the sum of its proper divisors (24143441).

21414444511 is an equidigital number, since it uses as much as digits as its factorization.

21414444511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24143440.

The product of its digits is 10240, while the sum is 31.

Adding to 21414444511 its reverse (11544441412), we get a palindrome (32958885923).

The spelling of 21414444511 in words is "twenty-one billion, four hundred fourteen million, four hundred forty-four thousand, five hundred eleven".