210121102000 has 80 divisors (see below), whose sum is σ = 509221863072. Its totient is φ = 83858361600.

The previous prime is 210121101947. The next prime is 210121102003. The reversal of 210121102000 is 201121012.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is not an unprimeable number, because it can be changed into a prime (210121102003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767422 + ... + 1004578.

Almost surely, 2^210121102000 is an apocalyptic number.

210121102000 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 210121102000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254610931536).

210121102000 is an abundant number, since it is smaller than the sum of its proper divisors (299100761072).

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

210121102000 is a wasteful number, since it uses less digits than its factorization.

210121102000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237623 (or 237607 counting only the distinct ones).

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

Adding to 210121102000 its reverse (201121012), we get a palindrome (210322223012).

The spelling of 210121102000 in words is "two hundred ten billion, one hundred twenty-one million, one hundred two thousand".