216251423441 has 2 divisors, whose sum is σ = 216251423442. Its totient is φ = 216251423440.

The previous prime is 216251423429. The next prime is 216251423447. The reversal of 216251423441 is 144324152612.

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., 194837491216 + 21413932225 = 441404^2 + 146335^2 .

It is a cyclic number.

It is not a de Polignac number, because 216251423441 - 2³⁴ = 199071554257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (216251423447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108125711720 + 108125711721.

It is an arithmetic number, because the mean of its divisors is an integer number (108125711721).

Almost surely, 2^216251423441 is an apocalyptic number.

It is an amenable number.

216251423441 is a deficient number, since it is larger than the sum of its proper divisors (1).

216251423441 is an equidigital number, since it uses as much as digits as its factorization.

216251423441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 35.

The spelling of 216251423441 in words is "two hundred sixteen billion, two hundred fifty-one million, four hundred twenty-three thousand, four hundred forty-one".