221422410 has 80 divisors (see below), whose sum is σ = 649531872. Its totient is φ = 53676000.

The previous prime is 221422379. The next prime is 221422417. The reversal of 221422410 is 14224122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221422417) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 3516 + ... + 21335.

Almost surely, 2^221422410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221422410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324765936).

221422410 is an abundant number, since it is smaller than the sum of its proper divisors (428109462).

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

221422410 is a wasteful number, since it uses less digits than its factorization.

221422410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24881 (or 24872 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221422410 is about 14880.2691507916. The cubic root of 221422410 is about 604.9793130918.

Adding to 221422410 its reverse (14224122), we get a palindrome (235646532).

It can be divided in two parts, 2 and 21422410, that added together give a palindrome (21422412).

The spelling of 221422410 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred ten".