221425340 has 24 divisors (see below), whose sum is σ = 492346512. Its totient is φ = 83360000.

The previous prime is 221425339. The next prime is 221425381. The reversal of 221425340 is 43524122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325286 + ... + 325965.

It is an arithmetic number, because the mean of its divisors is an integer number (20514438).

Almost surely, 2^221425340 is an apocalyptic number.

221425340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221425340 is an abundant number, since it is smaller than the sum of its proper divisors (270921172).

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

221425340 is a wasteful number, since it uses less digits than its factorization.

221425340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651277 (or 651275 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 221425340 is about 14880.3676029862. The cubic root of 221425340 is about 604.9819815684.

Adding to 221425340 its reverse (43524122), we get a palindrome (264949462).

The spelling of 221425340 in words is "two hundred twenty-one million, four hundred twenty-five thousand, three hundred forty".