21444330411 has 48 divisors (see below), whose sum is σ = 37819641600. Its totient is φ = 11435649984.

The previous prime is 21444330359. The next prime is 21444330431. The reversal of 21444330411 is 11403344412.

21444330411 is a `hidden beast` number, since 214 + 4 + 4 + 3 + 30 + 411 = 666.

It is not a de Polignac number, because 21444330411 - 2⁹ = 21444329899 is a prime.

It is a super-2 number, since 2×21444330411² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21444330431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53496 + ... + 213893.

It is an arithmetic number, because the mean of its divisors is an integer number (787909200).

Almost surely, 2^21444330411 is an apocalyptic number.

21444330411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21444330411 is a deficient number, since it is larger than the sum of its proper divisors (16375311189).

21444330411 is a wasteful number, since it uses less digits than its factorization.

21444330411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267488 (or 267485 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21444330411 its reverse (11403344412), we get a palindrome (32847674823).

The spelling of 21444330411 in words is "twenty-one billion, four hundred forty-four million, three hundred thirty thousand, four hundred eleven".