12020022221 has 4 divisors (see below), whose sum is σ = 12139032444. Its totient is φ = 11901012000.

The previous prime is 12020022211. The next prime is 12020022241. The reversal of 12020022221 is 12222002021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9656992900 + 2363029321 = 98270^2 + 48611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12020022221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020022196 and 12020022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020022211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59504960 + ... + 59505161.

It is an arithmetic number, because the mean of its divisors is an integer number (3034758111).

Almost surely, 2^12020022221 is an apocalyptic number.

It is an amenable number.

12020022221 is a deficient number, since it is larger than the sum of its proper divisors (119010223).

12020022221 is a wasteful number, since it uses less digits than its factorization.

12020022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119010222.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 12020022221 its reverse (12222002021), we get a palindrome (24242024242).

The spelling of 12020022221 in words is "twelve billion, twenty million, twenty-two thousand, two hundred twenty-one".