210021012220 has 12 divisors (see below), whose sum is σ = 441044125704. Its totient is φ = 84008404880.

The previous prime is 210021012217. The next prime is 210021012221. The reversal of 210021012220 is 22210120012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021012221) 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, 5250525286 + ... + 5250525325.

It is an arithmetic number, because the mean of its divisors is an integer number (36753677142).

Almost surely, 2^210021012220 is an apocalyptic number.

210021012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021012220 is an abundant number, since it is smaller than the sum of its proper divisors (231023113484).

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

210021012220 is a wasteful number, since it uses less digits than its factorization.

210021012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501050620 (or 10501050618 counting only the distinct ones).

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

Adding to 210021012220 its reverse (22210120012), we get a palindrome (232231132232).

The spelling of 210021012220 in words is "two hundred ten billion, twenty-one million, twelve thousand, two hundred twenty".