21440024354153 has 16 divisors (see below), whose sum is σ = 21681876819600. Its totient is φ = 21198766848000.

The previous prime is 21440024354107. The next prime is 21440024354167. The reversal of 21440024354153 is 35145342004412.

It can be written as a sum of positive squares in 8 ways, for example, as 2074717590544 + 19365306763609 = 1440388^2 + 4400603^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440024354153 - 2²² = 21440020159849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440024354453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300830543 + ... + 300901803.

It is an arithmetic number, because the mean of its divisors is an integer number (1355117301225).

Almost surely, 2^{21440024354153} is an apocalyptic number.

It is an amenable number.

21440024354153 is a deficient number, since it is larger than the sum of its proper divisors (241852465447).

21440024354153 is a wasteful number, since it uses less digits than its factorization.

21440024354153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75388.

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 21440024354153 its reverse (35145342004412), we get a palindrome (56585366358565).

The spelling of 21440024354153 in words is "twenty-one trillion, four hundred forty billion, twenty-four million, three hundred fifty-four thousand, one hundred fifty-three".