121200221000 has 128 divisors (see below), whose sum is σ = 302628268800. Its totient is φ = 45298828800.

The previous prime is 121200220993. The next prime is 121200221011. The reversal of 121200221000 is 122002121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1343309 + ... + 1430691.

It is an arithmetic number, because the mean of its divisors is an integer number (2364283350).

Almost surely, 2^121200221000 is an apocalyptic number.

121200221000 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 121200221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151314134400).

121200221000 is an abundant number, since it is smaller than the sum of its proper divisors (181428047800).

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

121200221000 is a wasteful number, since it uses less digits than its factorization.

121200221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87496 (or 87482 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121200221000 its reverse (122002121), we get a palindrome (121322223121).

The spelling of 121200221000 in words is "one hundred twenty-one billion, two hundred million, two hundred twenty-one thousand".