21110101233251 has 2 divisors, whose sum is σ = 21110101233252. Its totient is φ = 21110101233250.

The previous prime is 21110101233211. The next prime is 21110101233341. The reversal of 21110101233251 is 15233210101112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110101233251 is a prime.

It is a super-2 number, since 2×21110101233251² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21110101233211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555050616625 + 10555050616626.

It is an arithmetic number, because the mean of its divisors is an integer number (10555050616626).

Almost surely, 2^{21110101233251} is an apocalyptic number.

21110101233251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110101233251 is an equidigital number, since it uses as much as digits as its factorization.

21110101233251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 21110101233251 its reverse (15233210101112), we get a palindrome (36343311334363).

The spelling of 21110101233251 in words is "twenty-one trillion, one hundred ten billion, one hundred one million, two hundred thirty-three thousand, two hundred fifty-one".