216112621 has 2 divisors, whose sum is σ = 216112622. Its totient is φ = 216112620.

The previous prime is 216112591. The next prime is 216112639. The reversal of 216112621 is 126211612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126810121 + 89302500 = 11261^2 + 9450^2 .

It is a cyclic number.

It is not a de Polignac number, because 216112621 - 2¹³ = 216104429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216112592 and 216112601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216112121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108056310 + 108056311.

It is an arithmetic number, because the mean of its divisors is an integer number (108056311).

Almost surely, 2^216112621 is an apocalyptic number.

It is an amenable number.

216112621 is a deficient number, since it is larger than the sum of its proper divisors (1).

216112621 is an equidigital number, since it uses as much as digits as its factorization.

216112621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 216112621 is about 14700.7694016334. The cubic root of 216112621 is about 600.1042605855.

The spelling of 216112621 in words is "two hundred sixteen million, one hundred twelve thousand, six hundred twenty-one".