121122221000 has 128 divisors (see below), whose sum is σ = 314434224000. Its totient is φ = 43297696000.

The previous prime is 121122220963. The next prime is 121122221063. The reversal of 121122221000 is 122221121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555686 + ... + 742314.

It is an arithmetic number, because the mean of its divisors is an integer number (2456517375).

Almost surely, 2^121122221000 is an apocalyptic number.

121122221000 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 121122221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157217112000).

121122221000 is an abundant number, since it is smaller than the sum of its proper divisors (193312003000).

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

121122221000 is a wasteful number, since it uses less digits than its factorization.

121122221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186720 (or 186706 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121122221000 its reverse (122221121), we get a palindrome (121244442121).

The spelling of 121122221000 in words is "one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand".