221125420 has 24 divisors (see below), whose sum is σ = 488804400. Its totient is φ = 83794752.

The previous prime is 221125369. The next prime is 221125481. The reversal of 221125420 is 24521122.

221125420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 290575 + ... + 291334.

It is an arithmetic number, because the mean of its divisors is an integer number (20366850).

Almost surely, 2^221125420 is an apocalyptic number.

221125420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221125420 is an abundant number, since it is smaller than the sum of its proper divisors (267678980).

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

221125420 is a wasteful number, since it uses less digits than its factorization.

221125420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581937 (or 581935 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 221125420 is about 14870.2864800918. The cubic root of 221125420 is about 604.7087093518.

Adding to 221125420 its reverse (24521122), we get a palindrome (245646542).

The spelling of 221125420 in words is "two hundred twenty-one million, one hundred twenty-five thousand, four hundred twenty".