220111121221081 has 2 divisors, whose sum is σ = 220111121221082. Its totient is φ = 220111121221080.

The previous prime is 220111121220941. The next prime is 220111121221127. The reversal of 220111121221081 is 180122121111022.

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., 198579813667225 + 21531307553856 = 14091835^2 + 4640184^2 .

It is a cyclic number.

It is not a de Polignac number, because 220111121221081 - 2⁴³ = 211315028198873 is a prime.

It is a super-2 number, since 2×220111121221081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220111121261081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110055560610540 + 110055560610541.

It is an arithmetic number, because the mean of its divisors is an integer number (110055560610541).

Almost surely, 2^{220111121221081} is an apocalyptic number.

It is an amenable number.

220111121221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

220111121221081 is an equidigital number, since it uses as much as digits as its factorization.

220111121221081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 25.

The spelling of 220111121221081 in words is "two hundred twenty trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, eighty-one".