216411321643 has 32 divisors (see below), whose sum is σ = 253849800960. Its totient is φ = 182592063360.

The previous prime is 216411321547. The next prime is 216411321673. The reversal of 216411321643 is 346123114612.

It is a cyclic number.

It is not a de Polignac number, because 216411321643 - 2⁹ = 216411321131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216411321599 and 216411321608.

It is not an unprimeable number, because it can be changed into a prime (216411321673) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 869196 + ... + 1090102.

It is an arithmetic number, because the mean of its divisors is an integer number (7932806280).

Almost surely, 2^216411321643 is an apocalyptic number.

216411321643 is a deficient number, since it is larger than the sum of its proper divisors (37438479317).

216411321643 is a wasteful number, since it uses less digits than its factorization.

216411321643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221067.

The product of its digits is 20736, while the sum is 34.

The spelling of 216411321643 in words is "two hundred sixteen billion, four hundred eleven million, three hundred twenty-one thousand, six hundred forty-three".