221425140 has 48 divisors (see below), whose sum is σ = 646950528. Its totient is φ = 56479104.

The previous prime is 221425093. The next prime is 221425199. The reversal of 221425140 is 41524122.

221425140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78847 + ... + 81606.

It is an arithmetic number, because the mean of its divisors is an integer number (13478136).

Almost surely, 2^221425140 is an apocalyptic number.

221425140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221425140 is an abundant number, since it is smaller than the sum of its proper divisors (425525388).

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

221425140 is a wasteful number, since it uses less digits than its factorization.

221425140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160488 (or 160486 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221425140 is about 14880.3608827206. The cubic root of 221425140 is about 604.9817994206.

Adding to 221425140 its reverse (41524122), we get a palindrome (262949262).

The spelling of 221425140 in words is "two hundred twenty-one million, four hundred twenty-five thousand, one hundred forty".