20110001221 has 8 divisors (see below), whose sum is σ = 20580902144. Its totient is φ = 19639247040.

The previous prime is 20110001213. The next prime is 20110001231. The reversal of 20110001221 is 12210001102.

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

It is a cyclic number.

It is not a de Polignac number, because 20110001221 - 2³ = 20110001213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110001198 and 20110001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110001231) 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, 270316 + ... + 336586.

It is an arithmetic number, because the mean of its divisors is an integer number (2572612768).

Almost surely, 2^20110001221 is an apocalyptic number.

It is an amenable number.

20110001221 is a deficient number, since it is larger than the sum of its proper divisors (470900923).

20110001221 is an equidigital number, since it uses as much as digits as its factorization.

20110001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73371.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20110001221 its reverse (12210001102), we get a palindrome (32320002323).

The spelling of 20110001221 in words is "twenty billion, one hundred ten million, one thousand, two hundred twenty-one".