121221111222220 has 96 divisors (see below), whose sum is σ = 268316384656320. Its totient is φ = 45875764408320.

The previous prime is 121221111222187. The next prime is 121221111222257. The reversal of 121221111222220 is 22222111122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221111222191 and 121221111222200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2436237582 + ... + 2436287338.

It is an arithmetic number, because the mean of its divisors is an integer number (2794962340170).

Almost surely, 2^{121221111222220} is an apocalyptic number.

121221111222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221111222220 is an abundant number, since it is smaller than the sum of its proper divisors (147095273434100).

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

121221111222220 is a wasteful number, since it uses less digits than its factorization.

121221111222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58123 (or 58121 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121221111222220 its reverse (22222111122121), we get a palindrome (143443222344341).

It can be divided in two parts, 12122111 and 1222220, that added together give a palindrome (13344331).

The spelling of 121221111222220 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty".