221244340 has 12 divisors (see below), whose sum is σ = 464613156. Its totient is φ = 88497728.

The previous prime is 221244329. The next prime is 221244347. The reversal of 221244340 is 43442122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 80964004 + 140280336 = 8998^2 + 11844^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221244347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5531089 + ... + 5531128.

It is an arithmetic number, because the mean of its divisors is an integer number (38717763).

Almost surely, 2^221244340 is an apocalyptic number.

221244340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221244340 is an abundant number, since it is smaller than the sum of its proper divisors (243368816).

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

221244340 is a wasteful number, since it uses less digits than its factorization.

221244340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11062226 (or 11062224 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 221244340 is about 14874.2845206080. The cubic root of 221244340 is about 604.8170928992.

Adding to 221244340 its reverse (43442122), we get a palindrome (264686462).

The spelling of 221244340 in words is "two hundred twenty-one million, two hundred forty-four thousand, three hundred forty".