210021211000 has 128 divisors (see below), whose sum is σ = 513230515200. Its totient is φ = 80291164800.

The previous prime is 210021210991. The next prime is 210021211003. The reversal of 210021211000 is 112120012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021211003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36314109 + ... + 36319891.

It is an arithmetic number, because the mean of its divisors is an integer number (4009613400).

Almost surely, 2^210021211000 is an apocalyptic number.

210021211000 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 210021211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256615257600).

210021211000 is an abundant number, since it is smaller than the sum of its proper divisors (303209304200).

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

210021211000 is a wasteful number, since it uses less digits than its factorization.

210021211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406 (or 7392 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210021211000 its reverse (112120012), we get a palindrome (210133331012).

The spelling of 210021211000 in words is "two hundred ten billion, twenty-one million, two hundred eleven thousand".