221002120 has 16 divisors (see below), whose sum is σ = 497254860. Its totient is φ = 88400832.

The previous prime is 221002097. The next prime is 221002121. The reversal of 221002120 is 21200122.

221002120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 205807716 + 15194404 = 14346^2 + 3898^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 221002097 and 221002106.

It is not an unprimeable number, because it can be changed into a prime (221002121) 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, 2762487 + ... + 2762566.

Almost surely, 2^221002120 is an apocalyptic number.

221002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221002120 is an abundant number, since it is smaller than the sum of its proper divisors (276252740).

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

221002120 is a wasteful number, since it uses less digits than its factorization.

221002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525064 (or 5525060 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 221002120 is about 14866.1400504637. The cubic root of 221002120 is about 604.5962928380.

Adding to 221002120 its reverse (21200122), we get a palindrome (242202242).

It can be divided in two parts, 221002 and 120, that added together give a palindrome (221122).

The spelling of 221002120 in words is "two hundred twenty-one million, two thousand, one hundred twenty".