221121020020220 has 48 divisors (see below), whose sum is σ = 468018824060928. Its totient is φ = 87750398191680.

The previous prime is 221121020020217. The next prime is 221121020020237. The reversal of 221121020020220 is 22020020121122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147159239 + ... + 148654241.

It is an arithmetic number, because the mean of its divisors is an integer number (9750392167936).

Almost surely, 2^{221121020020220} is an apocalyptic number.

221121020020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121020020220 is an abundant number, since it is smaller than the sum of its proper divisors (246897804040708).

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

221121020020220 is a wasteful number, since it uses less digits than its factorization.

221121020020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553370 (or 1553368 counting only the distinct ones).

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

Adding to 221121020020220 its reverse (22020020121122), we get a palindrome (243141040141342).

The spelling of 221121020020220 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty million, twenty thousand, two hundred twenty".