210021311220 has 384 divisors, whose sum is σ = 714031718400. Its totient is φ = 45105113088.

The previous prime is 210021311179. The next prime is 210021311231. The reversal of 210021311220 is 22113120012.

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 210021311220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 188022102 + ... + 188023218.

It is an arithmetic number, because the mean of its divisors is an integer number (1859457600).

Almost surely, 2^210021311220 is an apocalyptic number.

210021311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210021311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357015859200).

210021311220 is an abundant number, since it is smaller than the sum of its proper divisors (504010407180).

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

210021311220 is a wasteful number, since it uses less digits than its factorization.

210021311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 210021311220 its reverse (22113120012), we get a palindrome (232134431232).

The spelling of 210021311220 in words is "two hundred ten billion, twenty-one million, three hundred eleven thousand, two hundred twenty".