210221002120 has 16 divisors (see below), whose sum is σ = 472997254860. Its totient is φ = 84088400832.

The previous prime is 210221002091. The next prime is 210221002177. The reversal of 210221002120 is 21200122012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 174555168804 + 35665833316 = 417798^2 + 188854^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 210221002120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2627762487 + ... + 2627762566.

Almost surely, 2^210221002120 is an apocalyptic number.

210221002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221002120 is an abundant number, since it is smaller than the sum of its proper divisors (262776252740).

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

210221002120 is a wasteful number, since it uses less digits than its factorization.

210221002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255525064 (or 5255525060 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210221002120 its reverse (21200122012), we get a palindrome (231421124132).

The spelling of 210221002120 in words is "two hundred ten billion, two hundred twenty-one million, two thousand, one hundred twenty".