221103661947 has 8 divisors (see below), whose sum is σ = 336919865856. Its totient is φ = 126344949672.

The previous prime is 221103661943. The next prime is 221103661969. The reversal of 221103661947 is 749166301122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221103661947 - 2² = 221103661943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221103661899 and 221103661908.

It is not an unprimeable number, because it can be changed into a prime (221103661943) 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 in 7 ways as a sum of consecutive naturals, for example, 5264372883 + ... + 5264372924.

It is an arithmetic number, because the mean of its divisors is an integer number (42114983232).

Almost surely, 2^221103661947 is an apocalyptic number.

221103661947 is a deficient number, since it is larger than the sum of its proper divisors (115816203909).

221103661947 is a wasteful number, since it uses less digits than its factorization.

221103661947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10528745817.

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 221103661947 in words is "two hundred twenty-one billion, one hundred three million, six hundred sixty-one thousand, nine hundred forty-seven".