121012221320 has 128 divisors (see below), whose sum is σ = 306879840000. Its totient is φ = 42674429952.

The previous prime is 121012221299. The next prime is 121012221329. The reversal of 121012221320 is 23122210121.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (121012221329) by changing a digit.

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, 1097261 + ... + 1202499.

It is an arithmetic number, because the mean of its divisors is an integer number (2397498750).

Almost surely, 2^121012221320 is an apocalyptic number.

121012221320 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 121012221320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153439920000).

121012221320 is an abundant number, since it is smaller than the sum of its proper divisors (185867618680).

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

121012221320 is a wasteful number, since it uses less digits than its factorization.

121012221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105375 (or 105371 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121012221320 its reverse (23122210121), we get a palindrome (144134431441).

The spelling of 121012221320 in words is "one hundred twenty-one billion, twelve million, two hundred twenty-one thousand, three hundred twenty".