21444125204513 has 8 divisors (see below), whose sum is σ = 23656440471840. Its totient is φ = 19275618160480.

The previous prime is 21444125204459. The next prime is 21444125204519. The reversal of 21444125204513 is 31540252144412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21444125204513 - 2³⁶ = 21375405727777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444125204519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10952054795 + ... + 10952056752.

It is an arithmetic number, because the mean of its divisors is an integer number (2957055058980).

Almost surely, 2^{21444125204513} is an apocalyptic number.

It is an amenable number.

21444125204513 is a deficient number, since it is larger than the sum of its proper divisors (2212315267327).

21444125204513 is a wasteful number, since it uses less digits than its factorization.

21444125204513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21904111647.

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 21444125204513 its reverse (31540252144412), we get a palindrome (52984377348925).

The spelling of 21444125204513 in words is "twenty-one trillion, four hundred forty-four billion, one hundred twenty-five million, two hundred four thousand, five hundred thirteen".