201220101011221 has 8 divisors (see below), whose sum is σ = 205517970054360. Its totient is φ = 196940797277952.

The previous prime is 201220101011213. The next prime is 201220101011227. The reversal of 201220101011221 is 122110101022102.

It can be written as a sum of positive squares in 4 ways, for example, as 79172535431025 + 122047565580196 = 8897895^2 + 11047514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201220101011221 - 2³ = 201220101011213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220101011195 and 201220101011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220101011227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4641305560 + ... + 4641348913.

It is an arithmetic number, because the mean of its divisors is an integer number (25689746256795).

Almost surely, 2^{201220101011221} is an apocalyptic number.

It is an amenable number.

201220101011221 is a deficient number, since it is larger than the sum of its proper divisors (4297869043139).

201220101011221 is an equidigital number, since it uses as much as digits as its factorization.

201220101011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282654935.

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

Adding to 201220101011221 its reverse (122110101022102), we get a palindrome (323330202033323).

The spelling of 201220101011221 in words is "two hundred one trillion, two hundred twenty billion, one hundred one million, eleven thousand, two hundred twenty-one".