111221021137 has 2 divisors, whose sum is σ = 111221021138. Its totient is φ = 111221021136.

The previous prime is 111221021081. The next prime is 111221021141. The reversal of 111221021137 is 731120122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73503885456 + 37717135681 = 271116^2 + 194209^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221021137 - 2¹⁵ = 111220988369 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221021167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610510568 + 55610510569.

It is an arithmetic number, because the mean of its divisors is an integer number (55610510569).

Almost surely, 2^111221021137 is an apocalyptic number.

It is an amenable number.

111221021137 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221021137 is an equidigital number, since it uses as much as digits as its factorization.

111221021137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 111221021137 its reverse (731120122111), we get a palindrome (842341143248).

The spelling of 111221021137 in words is "one hundred eleven billion, two hundred twenty-one million, twenty-one thousand, one hundred thirty-seven".