121220000 has 240 divisors, whose sum is σ = 354261600. Its totient is φ = 40320000.

The previous prime is 121219999. The next prime is 121220017. The reversal of 121220000 is 22121.

Added to its reverse (22121) it gives a square (121242121 = 11011²).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 121220000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4179986 + ... + 4180014.

It is an arithmetic number, because the mean of its divisors is an integer number (1476090).

Almost surely, 2^121220000 is an apocalyptic number.

121220000 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 121220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177130800).

121220000 is an abundant number, since it is smaller than the sum of its proper divisors (233041600).

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

121220000 is a wasteful number, since it uses less digits than its factorization.

121220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 66 counting only the distinct ones).

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

The square root of 121220000 is about 11009.9954586730. The cubic root of 121220000 is about 494.9083257090.

Adding to 121220000 its reverse (22121), we get a palindrome (121242121).

It can be divided in two parts, 1212 and 20000, that added together give a palindrome (21212).

The spelling of 121220000 in words is "one hundred twenty-one million, two hundred twenty thousand".