216420053 has 2 divisors, whose sum is σ = 216420054. Its totient is φ = 216420052.

The previous prime is 216420023. The next prime is 216420077. The reversal of 216420053 is 350024612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206698129 + 9721924 = 14377^2 + 3118^2 .

It is a cyclic number.

It is not a de Polignac number, because 216420053 - 2¹⁶ = 216354517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216420023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108210026 + 108210027.

It is an arithmetic number, because the mean of its divisors is an integer number (108210027).

Almost surely, 2^216420053 is an apocalyptic number.

It is an amenable number.

216420053 is a deficient number, since it is larger than the sum of its proper divisors (1).

216420053 is an equidigital number, since it uses as much as digits as its factorization.

216420053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 216420053 is about 14711.2220090651. Note that the first 3 decimals coincide. The cubic root of 216420053 is about 600.3886861138.

Adding to 216420053 its reverse (350024612), we get a palindrome (566444665).

The spelling of 216420053 in words is "two hundred sixteen million, four hundred twenty thousand, fifty-three".