221141761 has 2 divisors, whose sum is σ = 221141762. Its totient is φ = 221141760.

The previous prime is 221141731. The next prime is 221141773. The reversal of 221141761 is 167141122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214066161 + 7075600 = 14631^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 221141761 - 2¹⁹ = 220617473 is a prime.

It is a super-2 number, since 2×221141761² = 97807356916362242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221141731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110570880 + 110570881.

It is an arithmetic number, because the mean of its divisors is an integer number (110570881).

Almost surely, 2^221141761 is an apocalyptic number.

It is an amenable number.

221141761 is a deficient number, since it is larger than the sum of its proper divisors (1).

221141761 is an equidigital number, since it uses as much as digits as its factorization.

221141761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 221141761 is about 14870.8359213596. The cubic root of 221141761 is about 604.7236048225.

Adding to 221141761 its reverse (167141122), we get a palindrome (388282883).

The spelling of 221141761 in words is "two hundred twenty-one million, one hundred forty-one thousand, seven hundred sixty-one".