20110321221 has 24 divisors (see below), whose sum is σ = 28315493280. Its totient is φ = 12693983904.

The previous prime is 20110321213. The next prime is 20110321223. The reversal of 20110321221 is 12212301102.

It is not a de Polignac number, because 20110321221 - 2³ = 20110321213 is a prime.

It is a super-2 number, since 2×20110321221² (a number of 21 digits) contains 22 as substring.

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 20110321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110321223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2381635 + ... + 2390063.

It is an arithmetic number, because the mean of its divisors is an integer number (1179812220).

Almost surely, 2^20110321221 is an apocalyptic number.

It is an amenable number.

20110321221 is a deficient number, since it is larger than the sum of its proper divisors (8205172059).

20110321221 is a wasteful number, since it uses less digits than its factorization.

20110321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673 (or 10654 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20110321221 its reverse (12212301102), we get a palindrome (32322622323).

The spelling of 20110321221 in words is "twenty billion, one hundred ten million, three hundred twenty-one thousand, two hundred twenty-one".