221101101021220 has 72 divisors (see below), whose sum is σ = 542026950200064. Its totient is φ = 75538225635264.

The previous prime is 221101101021197. The next prime is 221101101021253. The reversal of 221101101021220 is 22120101101122.

It is a junction number, because it is equal to n+sod(n) for n = 221101101021194 and 221101101021203.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 398332852 + ... + 398887531.

It is an arithmetic number, because the mean of its divisors is an integer number (7528152086112).

Almost surely, 2^{221101101021220} is an apocalyptic number.

221101101021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221101101021220 is an abundant number, since it is smaller than the sum of its proper divisors (320925849178844).

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

221101101021220 is a wasteful number, since it uses less digits than its factorization.

221101101021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797220689 (or 797220680 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221101101021220 its reverse (22120101101122), we get a palindrome (243221202122342).

The spelling of 221101101021220 in words is "two hundred twenty-one trillion, one hundred one billion, one hundred one million, twenty-one thousand, two hundred twenty".