221423160 has 96 divisors (see below), whose sum is σ = 772742160. Its totient is φ = 50609664.

The previous prime is 221423123. The next prime is 221423171. The reversal of 221423160 is 61324122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12949 + ... + 24708.

Almost surely, 2^221423160 is an apocalyptic number.

221423160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221423160 is an abundant number, since it is smaller than the sum of its proper divisors (551319000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221423160 is a wasteful number, since it uses less digits than its factorization.

221423160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37685 (or 37674 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 221423160 is about 14880.2943519273. The cubic root of 221423160 is about 604.9799961512.

Adding to 221423160 its reverse (61324122), we get a palindrome (282747282).

The spelling of 221423160 in words is "two hundred twenty-one million, four hundred twenty-three thousand, one hundred sixty".