111211112111251 has 2 divisors, whose sum is σ = 111211112111252. Its totient is φ = 111211112111250.

The previous prime is 111211112111243. The next prime is 111211112111257. The reversal of 111211112111251 is 152111211112111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111211112111251 - 2³ = 111211112111243 is a prime.

It is a super-2 number, since 2×111211112111251² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111211112111257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605556055625 + 55605556055626.

It is an arithmetic number, because the mean of its divisors is an integer number (55605556055626).

Almost surely, 2^{111211112111251} is an apocalyptic number.

111211112111251 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211112111251 is an equidigital number, since it uses as much as digits as its factorization.

111211112111251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40, while the sum is 22.

Adding to 111211112111251 its reverse (152111211112111), we get a palindrome (263322323223362).

The spelling of 111211112111251 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred twelve million, one hundred eleven thousand, two hundred fifty-one".