221115706061 has 2 divisors, whose sum is σ = 221115706062. Its totient is φ = 221115706060.

The previous prime is 221115706057. The next prime is 221115706087. The reversal of 221115706061 is 160607511122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196764103561 + 24351602500 = 443581^2 + 156050^2 .

It is a cyclic number.

It is not a de Polignac number, because 221115706061 - 2² = 221115706057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221115706561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110557853030 + 110557853031.

It is an arithmetic number, because the mean of its divisors is an integer number (110557853031).

Almost surely, 2^221115706061 is an apocalyptic number.

It is an amenable number.

221115706061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221115706061 is an equidigital number, since it uses as much as digits as its factorization.

221115706061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 221115706061 in words is "two hundred twenty-one billion, one hundred fifteen million, seven hundred six thousand, sixty-one".