21011041268653 has 2 divisors, whose sum is σ = 21011041268654. Its totient is φ = 21011041268652.

The previous prime is 21011041268641. The next prime is 21011041268743. The reversal of 21011041268653 is 35686214011012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10682190163044 + 10328851105609 = 3268362^2 + 3213853^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011041268653 - 2²¹ = 21011039171501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011041268603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505520634326 + 10505520634327.

It is an arithmetic number, because the mean of its divisors is an integer number (10505520634327).

Almost surely, 2^{21011041268653} is an apocalyptic number.

It is an amenable number.

21011041268653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011041268653 is an equidigital number, since it uses as much as digits as its factorization.

21011041268653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

Adding to 21011041268653 its reverse (35686214011012), we get a palindrome (56697255279665).

The spelling of 21011041268653 in words is "twenty-one trillion, eleven billion, forty-one million, two hundred sixty-eight thousand, six hundred fifty-three".