111211021157 has 2 divisors, whose sum is σ = 111211021158. Its totient is φ = 111211021156.

The previous prime is 111211021153. The next prime is 111211021261. The reversal of 111211021157 is 751120112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69991464481 + 41219556676 = 264559^2 + 203026^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211021157 - 2² = 111211021153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211021153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605510578 + 55605510579.

It is an arithmetic number, because the mean of its divisors is an integer number (55605510579).

Almost surely, 2^111211021157 is an apocalyptic number.

It is an amenable number.

111211021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211021157 is an equidigital number, since it uses as much as digits as its factorization.

111211021157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 23.

Adding to 111211021157 its reverse (751120112111), we get a palindrome (862331133268).

The spelling of 111211021157 in words is "one hundred eleven billion, two hundred eleven million, twenty-one thousand, one hundred fifty-seven".