111221002157 has 2 divisors, whose sum is σ = 111221002158. Its totient is φ = 111221002156.

The previous prime is 111221002121. The next prime is 111221002177. The reversal of 111221002157 is 751200122111.

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., 101543558281 + 9677443876 = 318659^2 + 98374^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221002157 - 2¹⁴ = 111220985773 is a prime.

It is a super-2 number, since 2×111221002157² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221002117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610501078 + 55610501079.

It is an arithmetic number, because the mean of its divisors is an integer number (55610501079).

Almost surely, 2^111221002157 is an apocalyptic number.

It is an amenable number.

111221002157 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221002157 is an equidigital number, since it uses as much as digits as its factorization.

111221002157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 111221002157 its reverse (751200122111), we get a palindrome (862421124268).

The spelling of 111221002157 in words is "one hundred eleven billion, two hundred twenty-one million, two thousand, one hundred fifty-seven".