221081941 has 2 divisors, whose sum is σ = 221081942. Its totient is φ = 221081940.

The previous prime is 221081933. The next prime is 221081983. The reversal of 221081941 is 149180122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218744100 + 2337841 = 14790^2 + 1529^2 .

It is a cyclic number.

It is not a de Polignac number, because 221081941 - 2³ = 221081933 is a prime.

It is a super-3 number, since 3×221081941³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221085941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110540970 + 110540971.

It is an arithmetic number, because the mean of its divisors is an integer number (110540971).

Almost surely, 2^221081941 is an apocalyptic number.

It is an amenable number.

221081941 is a deficient number, since it is larger than the sum of its proper divisors (1).

221081941 is an equidigital number, since it uses as much as digits as its factorization.

221081941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 221081941 is about 14868.8244659758. The cubic root of 221081941 is about 604.6690729419.

The spelling of 221081941 in words is "two hundred twenty-one million, eighty-one thousand, nine hundred forty-one".