221221201102220 has 48 divisors (see below), whose sum is σ = 513935655964416. Its totient is φ = 79311058008000.

The previous prime is 221221201102123. The next prime is 221221201102259. The reversal of 221221201102220 is 22201102122122.

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 = 221221201102192 and 221221201102201.

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, 7081328846 + ... + 7081360085.

It is an arithmetic number, because the mean of its divisors is an integer number (10706992832592).

Almost surely, 2^{221221201102220} is an apocalyptic number.

221221201102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221201102220 is an abundant number, since it is smaller than the sum of its proper divisors (292714454862196).

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

221221201102220 is a wasteful number, since it uses less digits than its factorization.

221221201102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14162689022 (or 14162689020 counting only the distinct ones).

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

Adding to 221221201102220 its reverse (22201102122122), we get a palindrome (243422303224342).

The spelling of 221221201102220 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred one million, one hundred two thousand, two hundred twenty".