221660086207 has 4 divisors (see below), whose sum is σ = 253325812816. Its totient is φ = 189994359600.

The previous prime is 221660086187. The next prime is 221660086259. The reversal of 221660086207 is 702680066122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 702680066122 = 2 ⋅351340033061.

It is a cyclic number.

It is not a de Polignac number, because 221660086207 - 2⁷ = 221660086079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221660086207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221660086007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15832863294 + ... + 15832863307.

It is an arithmetic number, because the mean of its divisors is an integer number (63331453204).

Almost surely, 2^221660086207 is an apocalyptic number.

221660086207 is a deficient number, since it is larger than the sum of its proper divisors (31665726609).

221660086207 is an equidigital number, since it uses as much as digits as its factorization.

221660086207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31665726608.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 221660086207 in words is "two hundred twenty-one billion, six hundred sixty million, eighty-six thousand, two hundred seven".