20227121 has 2 divisors, whose sum is σ = 20227122. Its totient is φ = 20227120.

The previous prime is 20227087. The next prime is 20227133. The reversal of 20227121 is 12172202.

20227121 is nontrivially palindromic in base 16.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13653025 + 6574096 = 3695^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20227121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20227121.

It is not a weakly prime, because it can be changed into another prime (20227421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10113560 + 10113561.

It is an arithmetic number, because the mean of its divisors is an integer number (10113561).

Almost surely, 2^20227121 is an apocalyptic number.

It is an amenable number.

20227121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20227121 is an equidigital number, since it uses as much as digits as its factorization.

20227121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20227121 is about 4497.4571704464. The cubic root of 20227121 is about 272.4653986310.

Adding to 20227121 its reverse (12172202), we get a palindrome (32399323).

The spelling of 20227121 in words is "twenty million, two hundred twenty-seven thousand, one hundred twenty-one".