221001221122220 has 96 divisors (see below), whose sum is σ = 578640120823296. Its totient is φ = 68881266316800.

The previous prime is 221001221122207. The next prime is 221001221122247. The reversal of 221001221122220 is 22221122100122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221001221122192 and 221001221122201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45556139 + ... + 50173341.

It is an arithmetic number, because the mean of its divisors is an integer number (6027501258576).

Almost surely, 2^{221001221122220} is an apocalyptic number.

221001221122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001221122220 is an abundant number, since it is smaller than the sum of its proper divisors (357638899701076).

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

221001221122220 is a wasteful number, since it uses less digits than its factorization.

221001221122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4648311 (or 4648309 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221001221122220 its reverse (22221122100122), we get a palindrome (243222343222342).

The spelling of 221001221122220 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".