111545251612121 has 2 divisors, whose sum is σ = 111545251612122. Its totient is φ = 111545251612120.

The previous prime is 111545251612111. The next prime is 111545251612147. The reversal of 111545251612121 is 121216152545111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106422435015625 + 5122816596496 = 10316125^2 + 2263364^2 .

It is a cyclic number.

It is not a de Polignac number, because 111545251612121 - 2¹⁰ = 111545251611097 is a prime.

It is a super-2 number, since 2×111545251612121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111545251612111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55772625806060 + 55772625806061.

It is an arithmetic number, because the mean of its divisors is an integer number (55772625806061).

Almost surely, 2^{111545251612121} is an apocalyptic number.

It is an amenable number.

111545251612121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111545251612121 is an equidigital number, since it uses as much as digits as its factorization.

111545251612121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 38.

The spelling of 111545251612121 in words is "one hundred eleven trillion, five hundred forty-five billion, two hundred fifty-one million, six hundred twelve thousand, one hundred twenty-one".