221660106307 has 2 divisors, whose sum is σ = 221660106308. Its totient is φ = 221660106306.

The previous prime is 221660106287. The next prime is 221660106329. The reversal of 221660106307 is 703601066122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221660106307 - 2⁷ = 221660106179 is a prime.

It is not a weakly prime, because it can be changed into another prime (221660106907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110830053153 + 110830053154.

It is an arithmetic number, because the mean of its divisors is an integer number (110830053154).

Almost surely, 2^221660106307 is an apocalyptic number.

221660106307 is a deficient number, since it is larger than the sum of its proper divisors (1).

221660106307 is an equidigital number, since it uses as much as digits as its factorization.

221660106307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 221660106307 in words is "two hundred twenty-one billion, six hundred sixty million, one hundred six thousand, three hundred seven".