20122011221 has 4 divisors (see below), whose sum is σ = 21669858252. Its totient is φ = 18574164192.

The previous prime is 20122011149. The next prime is 20122011229. The reversal of 20122011221 is 12211022102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12211022102 = 2 ⋅6105511051.

It can be written as a sum of positive squares in 2 ways, for example, as 3850202500 + 16271808721 = 62050^2 + 127561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122011221 - 2³⁰ = 19048269397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122011196 and 20122011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122011229) 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, 773923496 + ... + 773923521.

It is an arithmetic number, because the mean of its divisors is an integer number (5417464563).

Almost surely, 2^20122011221 is an apocalyptic number.

It is an amenable number.

20122011221 is a deficient number, since it is larger than the sum of its proper divisors (1547847031).

20122011221 is a wasteful number, since it uses less digits than its factorization.

20122011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547847030.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20122011221 its reverse (12211022102), we get a palindrome (32333033323).

The spelling of 20122011221 in words is "twenty billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".