21102111087353 has 2 divisors, whose sum is σ = 21102111087354. Its totient is φ = 21102111087352.

The previous prime is 21102111087329. The next prime is 21102111087361. The reversal of 21102111087353 is 35378011120112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11487944235769 + 9614166851584 = 3389387^2 + 3100672^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102111087353 - 2²⁰ = 21102110038777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102111083353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551055543676 + 10551055543677.

It is an arithmetic number, because the mean of its divisors is an integer number (10551055543677).

Almost surely, 2^{21102111087353} is an apocalyptic number.

It is an amenable number.

21102111087353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102111087353 is an equidigital number, since it uses as much as digits as its factorization.

21102111087353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 21102111087353 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, eighty-seven thousand, three hundred fifty-three".