21444022011 has 4 divisors (see below), whose sum is σ = 28592029352. Its totient is φ = 14296014672.

The previous prime is 21444022001. The next prime is 21444022021. The reversal of 21444022011 is 11022044412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21444022001) and next prime (21444022021).

It is not a de Polignac number, because 21444022011 - 2⁵ = 21444021979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444022001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3574003666 + ... + 3574003671.

It is an arithmetic number, because the mean of its divisors is an integer number (7148007338).

Almost surely, 2^21444022011 is an apocalyptic number.

21444022011 is a deficient number, since it is larger than the sum of its proper divisors (7148007341).

21444022011 is an equidigital number, since it uses as much as digits as its factorization.

21444022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7148007340.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21444022011 its reverse (11022044412), we get a palindrome (32466066423).

The spelling of 21444022011 in words is "twenty-one billion, four hundred forty-four million, twenty-two thousand, eleven".