21140332453 has 2 divisors, whose sum is σ = 21140332454. Its totient is φ = 21140332452.

The previous prime is 21140332363. The next prime is 21140332457. The reversal of 21140332453 is 35423304112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12468625569 + 8671706884 = 111663^2 + 93122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140332453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140332457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570166226 + 10570166227.

It is an arithmetic number, because the mean of its divisors is an integer number (10570166227).

Almost surely, 2^21140332453 is an apocalyptic number.

It is an amenable number.

21140332453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140332453 is an equidigital number, since it uses as much as digits as its factorization.

21140332453 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21140332453 its reverse (35423304112), we get a palindrome (56563636565).

The spelling of 21140332453 in words is "twenty-one billion, one hundred forty million, three hundred thirty-two thousand, four hundred fifty-three".