221201021001220 has 48 divisors (see below), whose sum is σ = 501617708540928. Its totient is φ = 81451677536640.

The previous prime is 221201021001139. The next prime is 221201021001223. The reversal of 221201021001220 is 22100120102122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221201021001194 and 221201021001203.

It is not an unprimeable number, because it can be changed into a prime (221201021001223) 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, 1158996076 + ... + 1159186915.

It is an arithmetic number, because the mean of its divisors is an integer number (10450368927936).

Almost surely, 2^{221201021001220} is an apocalyptic number.

221201021001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201021001220 is an abundant number, since it is smaller than the sum of its proper divisors (280416687539708).

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

221201021001220 is a wasteful number, since it uses less digits than its factorization.

221201021001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318183380 (or 2318183378 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221201021001220 its reverse (22100120102122), we get a palindrome (243301141103342).

The spelling of 221201021001220 in words is "two hundred twenty-one trillion, two hundred one billion, twenty-one million, one thousand, two hundred twenty".