16211955352321 has 2 divisors, whose sum is σ = 16211955352322. Its totient is φ = 16211955352320.

The previous prime is 16211955352309. The next prime is 16211955352331. The reversal of 16211955352321 is 12325355911261.

It is a happy number.

16211955352321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14416183828225 + 1795771524096 = 3796865^2 + 1340064^2 .

It is a cyclic number.

It is not a de Polignac number, because 16211955352321 - 2⁵ = 16211955352289 is a prime.

It is not a weakly prime, because it can be changed into another prime (16211955352331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8105977676160 + 8105977676161.

It is an arithmetic number, because the mean of its divisors is an integer number (8105977676161).

Almost surely, 2^{16211955352321} is an apocalyptic number.

It is an amenable number.

16211955352321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16211955352321 is an equidigital number, since it uses as much as digits as its factorization.

16211955352321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486000, while the sum is 46.

The spelling of 16211955352321 in words is "sixteen trillion, two hundred eleven billion, nine hundred fifty-five million, three hundred fifty-two thousand, three hundred twenty-one".