21440282653 has 2 divisors, whose sum is σ = 21440282654. Its totient is φ = 21440282652.

The previous prime is 21440282641. The next prime is 21440282707. The reversal of 21440282653 is 35628204412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18300137284 + 3140145369 = 135278^2 + 56037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440282653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440282603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720141326 + 10720141327.

It is an arithmetic number, because the mean of its divisors is an integer number (10720141327).

Almost surely, 2^21440282653 is an apocalyptic number.

It is an amenable number.

21440282653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440282653 is an equidigital number, since it uses as much as digits as its factorization.

21440282653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 21440282653 in words is "twenty-one billion, four hundred forty million, two hundred eighty-two thousand, six hundred fifty-three".