221797667 has 12 divisors (see below), whose sum is σ = 277857216. Its totient is φ = 175487760.

The previous prime is 221797651. The next prime is 221797687. The reversal of 221797667 is 766797122.

221797667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221797667 - 2⁴ = 221797651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221797627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173459 + ... + 174732.

It is an arithmetic number, because the mean of its divisors is an integer number (23154768).

Almost surely, 2^221797667 is an apocalyptic number.

221797667 is a deficient number, since it is larger than the sum of its proper divisors (56059549).

221797667 is a wasteful number, since it uses less digits than its factorization.

221797667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348218 (or 348211 counting only the distinct ones).

The product of its digits is 444528, while the sum is 47.

The square root of 221797667 is about 14892.8730270556. The cubic root of 221797667 is about 605.3208843497.

The spelling of 221797667 in words is "two hundred twenty-one million, seven hundred ninety-seven thousand, six hundred sixty-seven".