20102211221 has 8 divisors (see below), whose sum is σ = 21352702104. Its totient is φ = 18859276800.

The previous prime is 20102211203. The next prime is 20102211229. The reversal of 20102211221 is 12211220102.

It can be written as a sum of positive squares in 4 ways, for example, as 2160948196 + 17941263025 = 46486^2 + 133945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102211196 and 20102211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102211229) 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 7 ways as a sum of consecutive naturals, for example, 1883630 + ... + 1894271.

It is an arithmetic number, because the mean of its divisors is an integer number (2669087763).

Almost surely, 2^20102211221 is an apocalyptic number.

It is an amenable number.

20102211221 is a deficient number, since it is larger than the sum of its proper divisors (1250490883).

20102211221 is a wasteful number, since it uses less digits than its factorization.

20102211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778231.

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

Adding to 20102211221 its reverse (12211220102), we get a palindrome (32313431323).

The spelling of 20102211221 in words is "twenty billion, one hundred two million, two hundred eleven thousand, two hundred twenty-one".