221221202020220 has 48 divisors (see below), whose sum is σ = 464873996664000. Its totient is φ = 88429553172480.

The previous prime is 221221202020171. The next prime is 221221202020229. The reversal of 221221202020220 is 22020202122122.

221221202020220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 221221202020192 and 221221202020201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221202020229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181889681 + ... + 183101879.

It is an arithmetic number, because the mean of its divisors is an integer number (9684874930500).

Almost surely, 2^{221221202020220} is an apocalyptic number.

221221202020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221202020220 is an abundant number, since it is smaller than the sum of its proper divisors (243652794643780).

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

221221202020220 is a wasteful number, since it uses less digits than its factorization.

221221202020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218278 (or 1218276 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 221221202020220 its reverse (22020202122122), we get a palindrome (243241404142342).

The spelling of 221221202020220 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, two hundred twenty".