20430121 has 2 divisors, whose sum is σ = 20430122. Its totient is φ = 20430120.

The previous prime is 20430083. The next prime is 20430127. The reversal of 20430121 is 12103402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 404496 = 4475^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430121 - 2⁷ = 20429993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20430127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215060 + 10215061.

It is an arithmetic number, because the mean of its divisors is an integer number (10215061).

Almost surely, 2^20430121 is an apocalyptic number.

It is an amenable number.

20430121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430121 is an equidigital number, since it uses as much as digits as its factorization.

20430121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20430121 is about 4519.9691370628. The cubic root of 20430121 is about 273.3738566067.

Adding to 20430121 its reverse (12103402), we get a palindrome (32533523).

The spelling of 20430121 in words is "twenty million, four hundred thirty thousand, one hundred twenty-one".