20122032221 has 12 divisors (see below), whose sum is σ = 20452192020. Its totient is φ = 19797039360.

The previous prime is 20122032197. The next prime is 20122032223. The reversal of 20122032221 is 12223022102.

It can be written as a sum of positive squares in 6 ways, for example, as 1496606596 + 18625425625 = 38686^2 + 136475^2 .

It is not a de Polignac number, because 20122032221 - 2⁶ = 20122032157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20122032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122032223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2239025 + ... + 2247993.

It is an arithmetic number, because the mean of its divisors is an integer number (1704349335).

Almost surely, 2^20122032221 is an apocalyptic number.

It is an amenable number.

20122032221 is a deficient number, since it is larger than the sum of its proper divisors (330159799).

20122032221 is an frugal number, since it uses more digits than its factorization.

20122032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9536 (or 9463 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20122032221 its reverse (12223022102), we get a palindrome (32345054323).

The spelling of 20122032221 in words is "twenty billion, one hundred twenty-two million, thirty-two thousand, two hundred twenty-one".