121220220000 has 720 divisors, whose sum is σ = 446038971840. Its totient is φ = 28786560000.

The previous prime is 121220219983. The next prime is 121220220047. The reversal of 121220220000 is 22022121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 428339859 + ... + 428340141.

It is an arithmetic number, because the mean of its divisors is an integer number (619498572).

Almost surely, 2^121220220000 is an apocalyptic number.

121220220000 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 121220220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223019485920).

121220220000 is an abundant number, since it is smaller than the sum of its proper divisors (324818751840).

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

121220220000 is a wasteful number, since it uses less digits than its factorization.

121220220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 121220220000 its reverse (22022121), we get a palindrome (121242242121).

The spelling of 121220220000 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand".