221668701 has 4 divisors (see below), whose sum is σ = 295558272. Its totient is φ = 147779132.

The previous prime is 221668691. The next prime is 221668703. The reversal of 221668701 is 107866122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221668701 - 2⁹ = 221668189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221668703) 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, 36944781 + ... + 36944786.

It is an arithmetic number, because the mean of its divisors is an integer number (73889568).

Almost surely, 2^221668701 is an apocalyptic number.

It is an amenable number.

221668701 is a deficient number, since it is larger than the sum of its proper divisors (73889571).

221668701 is an equidigital number, since it uses as much as digits as its factorization.

221668701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73889570.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 221668701 is about 14888.5426083281. The cubic root of 221668701 is about 605.2035387380.

The spelling of 221668701 in words is "two hundred twenty-one million, six hundred sixty-eight thousand, seven hundred one".