21441111021005 has 16 divisors (see below), whose sum is σ = 29338425217584. Its totient is φ = 14902057251840.

The previous prime is 21441111020983. The next prime is 21441111021079. The reversal of 21441111021005 is 50012011114412.

It can be written as a sum of positive squares in 8 ways, for example, as 2705899981444 + 18735211039561 = 1644962^2 + 4328419^2 .

It is not a de Polignac number, because 21441111021005 - 2⁴² = 17043064509901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9701859086 + ... + 9701861295.

It is an arithmetic number, because the mean of its divisors is an integer number (1833651576099).

Almost surely, 2^{21441111021005} is an apocalyptic number.

It is an amenable number.

21441111021005 is a deficient number, since it is larger than the sum of its proper divisors (7897314196579).

21441111021005 is a wasteful number, since it uses less digits than its factorization.

21441111021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19403720416.

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 21441111021005 its reverse (50012011114412), we get a palindrome (71453122135417).

The spelling of 21441111021005 in words is "twenty-one trillion, four hundred forty-one billion, one hundred eleven million, twenty-one thousand, five".