121220222220 has 96 divisors (see below), whose sum is σ = 380863707840. Its totient is φ = 32005324800.

The previous prime is 121220222213. The next prime is 121220222237. The reversal of 121220222220 is 22222022121.

121220222220 is a `hidden beast` number, since 1 + 2 + 1 + 220 + 222 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 121220222193 and 121220222202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1056757 + ... + 1165836.

It is an arithmetic number, because the mean of its divisors is an integer number (3967330290).

Almost surely, 2^121220222220 is an apocalyptic number.

121220222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220222220 is an abundant number, since it is smaller than the sum of its proper divisors (259643485620).

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

121220222220 is a wasteful number, since it uses less digits than its factorization.

121220222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222712 (or 2222704 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 121220222220 its reverse (22222022121), we get a palindrome (143442244341).

The spelling of 121220222220 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty".