21441025442405 has 4 divisors (see below), whose sum is σ = 25729230530892. Its totient is φ = 17152820353920.

The previous prime is 21441025442401. The next prime is 21441025442429. The reversal of 21441025442405 is 50424452014412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13380247041604 + 8060778400801 = 3657902^2 + 2839151^2 .

It is not a de Polignac number, because 21441025442405 - 2² = 21441025442401 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 (21441025442401) 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, 2144102544236 + ... + 2144102544245.

It is an arithmetic number, because the mean of its divisors is an integer number (6432307632723).

Almost surely, 2^{21441025442405} is an apocalyptic number.

It is an amenable number.

21441025442405 is a deficient number, since it is larger than the sum of its proper divisors (4288205088487).

21441025442405 is an equidigital number, since it uses as much as digits as its factorization.

21441025442405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288205088486.

The product of its (nonzero) digits is 204800, while the sum is 38.

Adding to 21441025442405 its reverse (50424452014412), we get a palindrome (71865477456817).

The spelling of 21441025442405 in words is "twenty-one trillion, four hundred forty-one billion, twenty-five million, four hundred forty-two thousand, four hundred five".