221520120 has 32 divisors (see below), whose sum is σ = 664560720. Its totient is φ = 59072000.

The previous prime is 221520119. The next prime is 221520121. The reversal of 221520120 is 21025122.

It is an interprime number because it is at equal distance from previous prime (221520119) and next prime (221520121).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221520120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221520121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922881 + ... + 923120.

Almost surely, 2^221520120 is an apocalyptic number.

221520120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221520120 is an abundant number, since it is smaller than the sum of its proper divisors (443040600).

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

221520120 is a wasteful number, since it uses less digits than its factorization.

221520120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846015 (or 1846011 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 221520120 is about 14883.5519954075. The cubic root of 221520120 is about 605.0682890837.

Adding to 221520120 its reverse (21025122), we get a palindrome (242545242).

The spelling of 221520120 in words is "two hundred twenty-one million, five hundred twenty thousand, one hundred twenty".