21111060347353 has 2 divisors, whose sum is σ = 21111060347354. Its totient is φ = 21111060347352.

The previous prime is 21111060347309. The next prime is 21111060347393. The reversal of 21111060347353 is 35374306011112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20605180939849 + 505879407504 = 4539293^2 + 711252^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111060347353 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111060347393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555530173676 + 10555530173677.

It is an arithmetic number, because the mean of its divisors is an integer number (10555530173677).

Almost surely, 2^{21111060347353} is an apocalyptic number.

It is an amenable number.

21111060347353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111060347353 is an equidigital number, since it uses as much as digits as its factorization.

21111060347353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

Adding to 21111060347353 its reverse (35374306011112), we get a palindrome (56485366358465).

The spelling of 21111060347353 in words is "twenty-one trillion, one hundred eleven billion, sixty million, three hundred forty-seven thousand, three hundred fifty-three".