1111221111601 has 2 divisors, whose sum is σ = 1111221111602. Its totient is φ = 1111221111600.

The previous prime is 1111221111599. The next prime is 1111221111617. The reversal of 1111221111601 is 1061111221111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 869770738225 + 241450373376 = 932615^2 + 491376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111221111601 - 2¹ = 1111221111599 is a prime.

Together with 1111221111599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1111221111661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555610555800 + 555610555801.

It is an arithmetic number, because the mean of its divisors is an integer number (555610555801).

Almost surely, 2^{1111221111601} is an apocalyptic number.

It is an amenable number.

1111221111601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111221111601 is an equidigital number, since it uses as much as digits as its factorization.

1111221111601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 19.

Adding to 1111221111601 its reverse (1061111221111), we get a palindrome (2172332332712).

The spelling of 1111221111601 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, six hundred one".