221200121201220 has 144 divisors (see below), whose sum is σ = 782476619433600. Its totient is φ = 50560027689024.

The previous prime is 221200121201203. The next prime is 221200121201243. The reversal of 221200121201220 is 22102121002122.

It is a happy number.

221200121201220 is a `hidden beast` number, since 2 + 2 + 120 + 0 + 121 + 201 + 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 = 221200121201193 and 221200121201202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1791322462 + ... + 1791445941.

Almost surely, 2^{221200121201220} is an apocalyptic number.

221200121201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200121201220 is an abundant number, since it is smaller than the sum of its proper divisors (561276498232380).

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

221200121201220 is a wasteful number, since it uses less digits than its factorization.

221200121201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582768439 (or 3582768420 counting only the distinct ones).

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

Adding to 221200121201220 its reverse (22102121002122), we get a palindrome (243302242203342).

The spelling of 221200121201220 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty".