22111221161 has 2 divisors, whose sum is σ = 22111221162. Its totient is φ = 22111221160.

The previous prime is 22111221149. The next prime is 22111221217. The reversal of 22111221161 is 16112211122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11094619561 + 11016601600 = 105331^2 + 104960^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111221161 - 2³⁴ = 4931351977 is a prime.

It is a super-2 number, since 2×22111221161² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22111221961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055610580 + 11055610581.

It is an arithmetic number, because the mean of its divisors is an integer number (11055610581).

Almost surely, 2^22111221161 is an apocalyptic number.

It is an amenable number.

22111221161 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111221161 is an equidigital number, since it uses as much as digits as its factorization.

22111221161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 20.

Adding to 22111221161 its reverse (16112211122), we get a palindrome (38223432283).

The spelling of 22111221161 in words is "twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, one hundred sixty-one".