210021121000 has 32 divisors (see below), whose sum is σ = 491449425480. Its totient is φ = 84008448000.

The previous prime is 210021120989. The next prime is 210021121019. The reversal of 210021121000 is 121120012.

It can be written as a sum of positive squares in 4 ways, for example, as 137874086596 + 72147034404 = 371314^2 + 268602^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105009561 + ... + 105011560.

Almost surely, 2^210021121000 is an apocalyptic number.

210021121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021121000 is an abundant number, since it is smaller than the sum of its proper divisors (281428304480).

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

210021121000 is a wasteful number, since it uses less digits than its factorization.

210021121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210021142 (or 210021128 counting only the distinct ones).

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

Adding to 210021121000 its reverse (121120012), we get a palindrome (210142241012).

The spelling of 210021121000 in words is "two hundred ten billion, twenty-one million, one hundred twenty-one thousand".