216267414521 has 2 divisors, whose sum is σ = 216267414522. Its totient is φ = 216267414520.

The previous prime is 216267414499. The next prime is 216267414527. The reversal of 216267414521 is 125414762612.

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., 154084511296 + 62182903225 = 392536^2 + 249365^2 .

It is a cyclic number.

It is not a de Polignac number, because 216267414521 - 2⁶ = 216267414457 is a prime.

It is not a weakly prime, because it can be changed into another prime (216267414527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108133707260 + 108133707261.

It is an arithmetic number, because the mean of its divisors is an integer number (108133707261).

Almost surely, 2^216267414521 is an apocalyptic number.

It is an amenable number.

216267414521 is a deficient number, since it is larger than the sum of its proper divisors (1).

216267414521 is an equidigital number, since it uses as much as digits as its factorization.

216267414521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The spelling of 216267414521 in words is "two hundred sixteen billion, two hundred sixty-seven million, four hundred fourteen thousand, five hundred twenty-one".