111132221621 has 2 divisors, whose sum is σ = 111132221622. Its totient is φ = 111132221620.

The previous prime is 111132221611. The next prime is 111132221647. The reversal of 111132221621 is 126122231111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82032979396 + 29099242225 = 286414^2 + 170585^2 .

It is an emirp because it is prime and its reverse (126122231111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111132221621 - 2³⁴ = 93952352437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111132221611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55566110810 + 55566110811.

It is an arithmetic number, because the mean of its divisors is an integer number (55566110811).

Almost surely, 2^111132221621 is an apocalyptic number.

It is an amenable number.

111132221621 is a deficient number, since it is larger than the sum of its proper divisors (1).

111132221621 is an equidigital number, since it uses as much as digits as its factorization.

111132221621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

Adding to 111132221621 its reverse (126122231111), we get a palindrome (237254452732).

The spelling of 111132221621 in words is "one hundred eleven billion, one hundred thirty-two million, two hundred twenty-one thousand, six hundred twenty-one".