20425121 has 2 divisors, whose sum is σ = 20425122. Its totient is φ = 20425120.

The previous prime is 20425117. The next prime is 20425159. The reversal of 20425121 is 12152402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19044496 + 1380625 = 4364^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425121 - 2² = 20425117 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20425121.

It is not a weakly prime, because it can be changed into another prime (20425021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212560 + 10212561.

It is an arithmetic number, because the mean of its divisors is an integer number (10212561).

Almost surely, 2^20425121 is an apocalyptic number.

It is an amenable number.

20425121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425121 is an equidigital number, since it uses as much as digits as its factorization.

20425121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20425121 is about 4519.4160020958. The cubic root of 20425121 is about 273.3515532504.

Adding to 20425121 its reverse (12152402), we get a palindrome (32577523).

The spelling of 20425121 in words is "twenty million, four hundred twenty-five thousand, one hundred twenty-one".