221282881 has 2 divisors, whose sum is σ = 221282882. Its totient is φ = 221282880.

The previous prime is 221282861. The next prime is 221282917. The reversal of 221282881 is 188282122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116834481 + 104448400 = 10809^2 + 10220^2 .

It is a cyclic number.

It is not a de Polignac number, because 221282881 - 2¹⁷ = 221151809 is a prime.

It is a super-2 number, since 2×221282881² = 97932226847320322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221282851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110641440 + 110641441.

It is an arithmetic number, because the mean of its divisors is an integer number (110641441).

Almost surely, 2^221282881 is an apocalyptic number.

It is an amenable number.

221282881 is a deficient number, since it is larger than the sum of its proper divisors (1).

221282881 is an equidigital number, since it uses as much as digits as its factorization.

221282881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8192, while the sum is 34.

The square root of 221282881 is about 14875.5800223050. The cubic root of 221282881 is about 604.8522107876.

The spelling of 221282881 in words is "two hundred twenty-one million, two hundred eighty-two thousand, eight hundred eighty-one".