121000210000 has 200 divisors, whose sum is σ = 299213677224. Its totient is φ = 47374080000.

The previous prime is 121000209997. The next prime is 121000210007. The reversal of 121000210000 is 12000121.

It can be written as a sum of positive squares in 20 ways, for example, as 99353561616 + 21646648384 = 315204^2 + 147128^2 .

It is a tau number, because it is divible by the number of its divisors (200).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000210007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 178729662 + ... + 178730338.

Almost surely, 2^121000210000 is an apocalyptic number.

121000210000 is a gapful number since it is divisible by the number (10) 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 121000210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149606838612).

121000210000 is an abundant number, since it is smaller than the sum of its proper divisors (178213467224).

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

121000210000 is an equidigital number, since it uses as much as digits as its factorization.

121000210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 121000210000 its reverse (12000121), we get a palindrome (121012210121).

The spelling of 121000210000 in words is "one hundred twenty-one billion, two hundred ten thousand".