221038396961 has 2 divisors, whose sum is σ = 221038396962. Its totient is φ = 221038396960.

The previous prime is 221038396949. The next prime is 221038397009. The reversal of 221038396961 is 169693830122.

It is a happy number.

221038396961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141503116561 + 79535280400 = 376169^2 + 282020^2 .

It is a cyclic number.

It is not a de Polignac number, because 221038396961 - 2³⁴ = 203858527777 is a prime.

It is a super-2 number, since 2×221038396961² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221038396661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110519198480 + 110519198481.

It is an arithmetic number, because the mean of its divisors is an integer number (110519198481).

Almost surely, 2^221038396961 is an apocalyptic number.

It is an amenable number.

221038396961 is a deficient number, since it is larger than the sum of its proper divisors (1).

221038396961 is an equidigital number, since it uses as much as digits as its factorization.

221038396961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 221038396961 in words is "two hundred twenty-one billion, thirty-eight million, three hundred ninety-six thousand, nine hundred sixty-one".