210221121000000 has 392 divisors, whose sum is σ = 758458659729888. Its totient is φ = 50962688000000.

The previous prime is 210221120999987. The next prime is 210221121000041. The reversal of 210221121000000 is 121122012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 210221121000000.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 29814832 + ... + 36185168.

Almost surely, 2^{210221121000000} is an apocalyptic number.

210221121000000 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 210221121000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379229329864944).

210221121000000 is an abundant number, since it is smaller than the sum of its proper divisors (548237538729888).

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

210221121000000 is an frugal number, since it uses more digits than its factorization.

210221121000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6370393 (or 6370358 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210221121000000 its reverse (121122012), we get a palindrome (210221242122012).

The spelling of 210221121000000 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twenty-one million", and thus it is an aban number.