221145687601 has 16 divisors (see below), whose sum is σ = 225828684928. Its totient is φ = 216497836800.

The previous prime is 221145687583. The next prime is 221145687617. The reversal of 221145687601 is 106786541122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221145687601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221145688601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38910706 + ... + 38916388.

It is an arithmetic number, because the mean of its divisors is an integer number (14114292808).

Almost surely, 2^221145687601 is an apocalyptic number.

It is an amenable number.

221145687601 is a deficient number, since it is larger than the sum of its proper divisors (4682997327).

221145687601 is a wasteful number, since it uses less digits than its factorization.

221145687601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8632.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 221145687601 in words is "two hundred twenty-one billion, one hundred forty-five million, six hundred eighty-seven thousand, six hundred one".