216387751462321 has 4 divisors (see below), whose sum is σ = 223849398064500. Its totient is φ = 208926104860144.

The previous prime is 216387751462273. The next prime is 216387751462339. The reversal of 216387751462321 is 123264157783612.

216387751462321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79323693768225 + 137064057694096 = 8906385^2 + 11707436^2 .

It is a cyclic number.

It is not a de Polignac number, because 216387751462321 - 2⁹ = 216387751461809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216387751462391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3730823301046 + ... + 3730823301103.

It is an arithmetic number, because the mean of its divisors is an integer number (55962349516125).

Almost surely, 2^{216387751462321} is an apocalyptic number.

It is an amenable number.

216387751462321 is a deficient number, since it is larger than the sum of its proper divisors (7461646602179).

216387751462321 is an equidigital number, since it uses as much as digits as its factorization.

216387751462321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461646602178.

The product of its digits is 20321280, while the sum is 58.

The spelling of 216387751462321 in words is "two hundred sixteen trillion, three hundred eighty-seven billion, seven hundred fifty-one million, four hundred sixty-two thousand, three hundred twenty-one".