1220221202120 has 32 divisors (see below), whose sum is σ = 2745685582200. Its totient is φ = 488055080448.

The previous prime is 1220221202119. The next prime is 1220221202129. The reversal of 1220221202120 is 212021220221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 622423167844 + 597798034276 = 788938^2 + 773174^2 .

It is not an unprimeable number, because it can be changed into a prime (1220221202129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447725 + ... + 1625084.

Almost surely, 2^{1220221202120} is an apocalyptic number.

1220221202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221202120 is an abundant number, since it is smaller than the sum of its proper divisors (1525464380080).

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

1220221202120 is a wasteful number, since it uses less digits than its factorization.

1220221202120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087537 (or 2087533 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220221202120 its reverse (212021220221), we get a palindrome (1432242422341).

The spelling of 1220221202120 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty".