210221212120 has 32 divisors (see below), whose sum is σ = 473093978400. Its totient is φ = 84071373568.

The previous prime is 210221212081. The next prime is 210221212181. The reversal of 210221212120 is 21212122012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210221212094 and 210221212103.

It is a congruent number.

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, 334780 + ... + 729739.

It is an arithmetic number, because the mean of its divisors is an integer number (14784186825).

Almost surely, 2^210221212120 is an apocalyptic number.

210221212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221212120 is an abundant number, since it is smaller than the sum of its proper divisors (262872766280).

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

210221212120 is a wasteful number, since it uses less digits than its factorization.

210221212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069467 (or 1069463 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210221212120 its reverse (21212122012), we get a palindrome (231433334132).

The spelling of 210221212120 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty".