20110220011221 has 4 divisors (see below), whose sum is σ = 26813626681632. Its totient is φ = 13406813340812.

The previous prime is 20110220011181. The next prime is 20110220011291. The reversal of 20110220011221 is 12211002201102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110220011221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20110220011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110220011291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351703335201 + ... + 3351703335206.

It is an arithmetic number, because the mean of its divisors is an integer number (6703406670408).

Almost surely, 2^{20110220011221} is an apocalyptic number.

It is an amenable number.

20110220011221 is a deficient number, since it is larger than the sum of its proper divisors (6703406670411).

20110220011221 is an equidigital number, since it uses as much as digits as its factorization.

20110220011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703406670410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20110220011221 its reverse (12211002201102), we get a palindrome (32321222212323).

The spelling of 20110220011221 in words is "twenty trillion, one hundred ten billion, two hundred twenty million, eleven thousand, two hundred twenty-one".