210021200000 has 192 divisors, whose sum is σ = 527875979400. Its totient is φ = 83220480000.

The previous prime is 210021199981. The next prime is 210021200017. The reversal of 210021200000 is 2120012.

It can be written as a sum of positive squares in 12 ways, for example, as 125888716864 + 84132483136 = 354808^2 + 290056^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43597592 + ... + 43602408.

Almost surely, 2^210021200000 is an apocalyptic number.

210021200000 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 210021200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263937989700).

210021200000 is an abundant number, since it is smaller than the sum of its proper divisors (317854779400).

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

210021200000 is an frugal number, since it uses more digits than its factorization.

210021200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965 (or 4933 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 210021200000 its reverse (2120012), we get a palindrome (210023320012).

The spelling of 210021200000 in words is "two hundred ten billion, twenty-one million, two hundred thousand".