1221120302220 has 192 divisors, whose sum is σ = 4675742883840. Its totient is φ = 257642954496.

The previous prime is 1221120302203. The next prime is 1221120302231. The reversal of 1221120302220 is 222030211221.

1221120302220 is a `hidden beast` number, since 1 + 2 + 21 + 120 + 302 + 220 = 666.

It is a super-2 number, since 2×1221120302220² (a number of 25 digits) contains 22 as substring.

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 = 1221120302193 and 1221120302202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12375772 + ... + 12474051.

It is an arithmetic number, because the mean of its divisors is an integer number (24352827520).

Almost surely, 2^{1221120302220} is an apocalyptic number.

1221120302220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221120302220 is an abundant number, since it is smaller than the sum of its proper divisors (3454622581620).

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

1221120302220 is a wasteful number, since it uses less digits than its factorization.

1221120302220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24849861 (or 24849853 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1221120302220 its reverse (222030211221), we get a palindrome (1443150513441).

Subtracting from 1221120302220 its reverse (222030211221), we obtain a palindrome (999090090999).

The spelling of 1221120302220 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, three hundred two thousand, two hundred twenty".