221120212001220 has 216 divisors, whose sum is σ = 791883814647744. Its totient is φ = 49787407942272.

The previous prime is 221120212001203. The next prime is 221120212001243. The reversal of 221120212001220 is 22100212021122.

It is a happy number.

221120212001220 is a `hidden beast` number, since 2 + 211 + 20 + 212 + 0 + 0 + 1 + 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 = 221120212001193 and 221120212001202.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 186500992 + ... + 187682871.

Almost surely, 2^{221120212001220} is an apocalyptic number.

221120212001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120212001220 is an abundant number, since it is smaller than the sum of its proper divisors (570763602646524).

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

221120212001220 is a wasteful number, since it uses less digits than its factorization.

221120212001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374183959 (or 374183947 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221120212001220 its reverse (22100212021122), we get a palindrome (243220424022342).

The spelling of 221120212001220 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twelve million, one thousand, two hundred twenty".