216523400053 has 2 divisors, whose sum is σ = 216523400054. Its totient is φ = 216523400052.

The previous prime is 216523400021. The next prime is 216523400059. The reversal of 216523400053 is 350004325612.

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., 180528962769 + 35994437284 = 424887^2 + 189722^2 .

It is a cyclic number.

It is not a de Polignac number, because 216523400053 - 2⁵ = 216523400021 is a prime.

It is a super-2 number, since 2×216523400053² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216523399988 and 216523400024.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216523400059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108261700026 + 108261700027.

It is an arithmetic number, because the mean of its divisors is an integer number (108261700027).

Almost surely, 2^216523400053 is an apocalyptic number.

It is an amenable number.

216523400053 is a deficient number, since it is larger than the sum of its proper divisors (1).

216523400053 is an equidigital number, since it uses as much as digits as its factorization.

216523400053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 216523400053 its reverse (350004325612), we get a palindrome (566527725665).

The spelling of 216523400053 in words is "two hundred sixteen billion, five hundred twenty-three million, four hundred thousand, fifty-three".