21110233357 has 2 divisors, whose sum is σ = 21110233358. Its totient is φ = 21110233356.

The previous prime is 21110233321. The next prime is 21110233369. The reversal of 21110233357 is 75333201112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19349088201 + 1761145156 = 139101^2 + 41966^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110233357 - 2¹¹ = 21110231309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110233307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555116678 + 10555116679.

It is an arithmetic number, because the mean of its divisors is an integer number (10555116679).

Almost surely, 2^21110233357 is an apocalyptic number.

It is an amenable number.

21110233357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110233357 is an equidigital number, since it uses as much as digits as its factorization.

21110233357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

Adding to 21110233357 its reverse (75333201112), we get a palindrome (96443434469).

The spelling of 21110233357 in words is "twenty-one billion, one hundred ten million, two hundred thirty-three thousand, three hundred fifty-seven".