221111031111281 has 2 divisors, whose sum is σ = 221111031111282. Its totient is φ = 221111031111280.

The previous prime is 221111031111277. The next prime is 221111031111317. The reversal of 221111031111281 is 182111130111122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183930122423056 + 37180908688225 = 13562084^2 + 6097615^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111031111281 - 2² = 221111031111277 is a prime.

It is a super-2 number, since 2×221111031111281² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221111031111281.

It is not a weakly prime, because it can be changed into another prime (221111031111181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555515555640 + 110555515555641.

It is an arithmetic number, because the mean of its divisors is an integer number (110555515555641).

Almost surely, 2^{221111031111281} is an apocalyptic number.

It is an amenable number.

221111031111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111031111281 is an equidigital number, since it uses as much as digits as its factorization.

221111031111281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 26.

The spelling of 221111031111281 in words is "two hundred twenty-one trillion, one hundred eleven billion, thirty-one million, one hundred eleven thousand, two hundred eighty-one".