21440060353 has 2 divisors, whose sum is σ = 21440060354. Its totient is φ = 21440060352.

The previous prime is 21440060347. The next prime is 21440060377. The reversal of 21440060353 is 35306004412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19672026049 + 1768034304 = 140257^2 + 42048^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440060353 - 2⁵ = 21440060321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21440060393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720030176 + 10720030177.

It is an arithmetic number, because the mean of its divisors is an integer number (10720030177).

Almost surely, 2^21440060353 is an apocalyptic number.

It is an amenable number.

21440060353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440060353 is an equidigital number, since it uses as much as digits as its factorization.

21440060353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21440060353 its reverse (35306004412), we get a palindrome (56746064765).

The spelling of 21440060353 in words is "twenty-one billion, four hundred forty million, sixty thousand, three hundred fifty-three".