21110112212257 has 2 divisors, whose sum is σ = 21110112212258. Its totient is φ = 21110112212256.

The previous prime is 21110112212117. The next prime is 21110112212339. The reversal of 21110112212257 is 75221221101112.

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., 15923739087936 + 5186373124321 = 3990456^2 + 2277361^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110112212257 - 2²³ = 21110103823649 is a prime.

It is a super-2 number, since 2×21110112212257² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21110112216257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555056106128 + 10555056106129.

It is an arithmetic number, because the mean of its divisors is an integer number (10555056106129).

Almost surely, 2^{21110112212257} is an apocalyptic number.

It is an amenable number.

21110112212257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110112212257 is an equidigital number, since it uses as much as digits as its factorization.

21110112212257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 28.

Adding to 21110112212257 its reverse (75221221101112), we get a palindrome (96331333313369).

The spelling of 21110112212257 in words is "twenty-one trillion, one hundred ten billion, one hundred twelve million, two hundred twelve thousand, two hundred fifty-seven".