21244434111 has 8 divisors (see below), whose sum is σ = 31473235760. Its totient is φ = 14162956056.

The previous prime is 21244434061. The next prime is 21244434151. The reversal of 21244434111 is 11143444212.

21244434111 is a `hidden beast` number, since 2 + 1 + 244 + 4 + 3 + 411 + 1 = 666.

It is not a de Polignac number, because 21244434111 - 2³³ = 12654499519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 786830893 = 21244434111 / (2 + 1 + 2 + 4 + 4 + 4 + 3 + 4 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244434151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393415420 + ... + 393415473.

It is an arithmetic number, because the mean of its divisors is an integer number (3934154470).

Almost surely, 2^21244434111 is an apocalyptic number.

21244434111 is a deficient number, since it is larger than the sum of its proper divisors (10228801649).

21244434111 is an equidigital number, since it uses as much as digits as its factorization.

21244434111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786830902 (or 786830896 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21244434111 its reverse (11143444212), we get a palindrome (32387878323).

The spelling of 21244434111 in words is "twenty-one billion, two hundred forty-four million, four hundred thirty-four thousand, one hundred eleven".