20535121 has 2 divisors, whose sum is σ = 20535122. Its totient is φ = 20535120.

The previous prime is 20535107. The next prime is 20535131. The reversal of 20535121 is 12153502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 2768896 = 4215^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535121 - 2⁵ = 20535089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20535131) 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, 10267560 + 10267561.

It is an arithmetic number, because the mean of its divisors is an integer number (10267561).

Almost surely, 2^20535121 is an apocalyptic number.

It is an amenable number.

20535121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535121 is an equidigital number, since it uses as much as digits as its factorization.

20535121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20535121 is about 4531.5693749517. The cubic root of 20535121 is about 273.8413888350.

Adding to 20535121 its reverse (12153502), we get a palindrome (32688623).

The spelling of 20535121 in words is "twenty million, five hundred thirty-five thousand, one hundred twenty-one".