20016121 has 2 divisors, whose sum is σ = 20016122. Its totient is φ = 20016120.

The previous prime is 20016103. The next prime is 20016131. The reversal of 20016121 is 12161002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 115600 = 4461^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 20016121 - 2¹¹ = 20014073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20016131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008060 + 10008061.

It is an arithmetic number, because the mean of its divisors is an integer number (10008061).

Almost surely, 2^20016121 is an apocalyptic number.

It is an amenable number.

20016121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016121 is an equidigital number, since it uses as much as digits as its factorization.

20016121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20016121 is about 4473.9379745365. The cubic root of 20016121 is about 271.5146739500.

Adding to 20016121 its reverse (12161002), we get a palindrome (32177123).

The spelling of 20016121 in words is "twenty million, sixteen thousand, one hundred twenty-one".