221428167 has 16 divisors (see below), whose sum is σ = 302961120. Its totient is φ = 143769600.

The previous prime is 221428127. The next prime is 221428187. The reversal of 221428167 is 761824122.

It is not a de Polignac number, because 221428167 - 2¹¹ = 221426119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221428127) 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, 93417 + ... + 95757.

It is an arithmetic number, because the mean of its divisors is an integer number (18935070).

Almost surely, 2^221428167 is an apocalyptic number.

221428167 is a deficient number, since it is larger than the sum of its proper divisors (81532953).

221428167 is a wasteful number, since it uses less digits than its factorization.

221428167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154.

The product of its digits is 10752, while the sum is 33.

The square root of 221428167 is about 14880.4625936158. The cubic root of 221428167 is about 604.9845562162.

It can be divided in two parts, 2214 and 28167, that added together give a triangular number (30381 = T₂₄₆).

The spelling of 221428167 in words is "two hundred twenty-one million, four hundred twenty-eight thousand, one hundred sixty-seven".