121220111221002 has 128 divisors (see below), whose sum is σ = 286603868954880. Its totient is φ = 37845864161280.

The previous prime is 121220111220983. The next prime is 121220111221007. The reversal of 121220111221002 is 200122111022121.

121220111221002 is a `hidden beast` number, since 121 + 220 + 1 + 112 + 210 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121220111221007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2470980858 + ... + 2471029914.

It is an arithmetic number, because the mean of its divisors is an integer number (2239092726210).

Almost surely, 2^{121220111221002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220111221002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143301934477440).

121220111221002 is an abundant number, since it is smaller than the sum of its proper divisors (165383757733878).

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

121220111221002 is a wasteful number, since it uses less digits than its factorization.

121220111221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62053 (or 62047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121220111221002 its reverse (200122111022121), we get a palindrome (321342222243123).

The spelling of 121220111221002 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, two".