53217121 has 2 divisors, whose sum is σ = 53217122. Its totient is φ = 53217120.

The previous prime is 53217097. The next prime is 53217133. The reversal of 53217121 is 12171235.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45037521 + 8179600 = 6711^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 53217121 - 2¹⁷ = 53086049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53217092 and 53217101.

It is not a weakly prime, because it can be changed into another prime (53217161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26608560 + 26608561.

It is an arithmetic number, because the mean of its divisors is an integer number (26608561).

Almost surely, 2^53217121 is an apocalyptic number.

It is an amenable number.

53217121 is a deficient number, since it is larger than the sum of its proper divisors (1).

53217121 is an equidigital number, since it uses as much as digits as its factorization.

53217121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 22.

The square root of 53217121 is about 7295.0065798462. The cubic root of 53217121 is about 376.1408127522.

Adding to 53217121 its reverse (12171235), we get a palindrome (65388356).

The spelling of 53217121 in words is "fifty-three million, two hundred seventeen thousand, one hundred twenty-one".