20120022221 has 4 divisors (see below), whose sum is σ = 21667716252. Its totient is φ = 18572328192.

The previous prime is 20120022187. The next prime is 20120022227. The reversal of 20120022221 is 12222002102.

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 5085829225 + 15034192996 = 71315^2 + 122614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120022221 - 2²² = 20115827917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20120022196 and 20120022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120022227) 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, 773846996 + ... + 773847021.

It is an arithmetic number, because the mean of its divisors is an integer number (5416929063).

Almost surely, 2^20120022221 is an apocalyptic number.

It is an amenable number.

20120022221 is a deficient number, since it is larger than the sum of its proper divisors (1547694031).

20120022221 is a wasteful number, since it uses less digits than its factorization.

20120022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547694030.

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

Adding to 20120022221 its reverse (12222002102), we get a palindrome (32342024323).

The spelling of 20120022221 in words is "twenty billion, one hundred twenty million, twenty-two thousand, two hundred twenty-one".