121021001200 has 120 divisors (see below), whose sum is σ = 321919931520. Its totient is φ = 43350700800.

The previous prime is 121021001197. The next prime is 121021001207. The reversal of 121021001200 is 2100120121.

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 (121021001207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89541 + ... + 500059.

It is an arithmetic number, because the mean of its divisors is an integer number (2682666096).

Almost surely, 2^121021001200 is an apocalyptic number.

121021001200 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 121021001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160959965760).

121021001200 is an abundant number, since it is smaller than the sum of its proper divisors (200898930320).

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

121021001200 is a wasteful number, since it uses less digits than its factorization.

121021001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410615 (or 410604 counting only the distinct ones).

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

Adding to 121021001200 its reverse (2100120121), we get a palindrome (123121121321).

The spelling of 121021001200 in words is "one hundred twenty-one billion, twenty-one million, one thousand, two hundred".