21302110553 has 2 divisors, whose sum is σ = 21302110554. Its totient is φ = 21302110552.

The previous prime is 21302110541. The next prime is 21302110597. The reversal of 21302110553 is 35501120312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20069538889 + 1232571664 = 141667^2 + 35108^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302110553 - 2³⁴ = 4122241369 is a prime.

It is not a weakly prime, because it can be changed into another prime (21302110523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651055276 + 10651055277.

It is an arithmetic number, because the mean of its divisors is an integer number (10651055277).

Almost surely, 2^21302110553 is an apocalyptic number.

It is an amenable number.

21302110553 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302110553 is an equidigital number, since it uses as much as digits as its factorization.

21302110553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21302110553 its reverse (35501120312), we get a palindrome (56803230865).

The spelling of 21302110553 in words is "twenty-one billion, three hundred two million, one hundred ten thousand, five hundred fifty-three".