221422365 has 48 divisors (see below), whose sum is σ = 408401136. Its totient is φ = 110592000.

The previous prime is 221422363. The next prime is 221422373. The reversal of 221422365 is 563224122.

It is a happy number.

221422365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 5861241 + 215561124 = 2421^2 + 14682^2 .

It is not a de Polignac number, because 221422365 - 2¹ = 221422363 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183765 + ... + 184965.

It is an arithmetic number, because the mean of its divisors is an integer number (8508357).

Almost surely, 2^221422365 is an apocalyptic number.

It is an amenable number.

221422365 is a deficient number, since it is larger than the sum of its proper divisors (186978771).

221422365 is a wasteful number, since it uses less digits than its factorization.

221422365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1467 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 221422365 is about 14880.2676387221. The cubic root of 221422365 is about 604.9792721082.

Adding to 221422365 its reverse (563224122), we get a palindrome (784646487).

The spelling of 221422365 in words is "two hundred twenty-one million, four hundred twenty-two thousand, three hundred sixty-five".