216442920949 has 2 divisors, whose sum is σ = 216442920950. Its totient is φ = 216442920948.

The previous prime is 216442920899. The next prime is 216442920989. The reversal of 216442920949 is 949029244612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211064898724 + 5378022225 = 459418^2 + 73335^2 .

It is a cyclic number.

It is not a de Polignac number, because 216442920949 - 2⁷ = 216442920821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216442920896 and 216442920905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216442920989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108221460474 + 108221460475.

It is an arithmetic number, because the mean of its divisors is an integer number (108221460475).

Almost surely, 2^216442920949 is an apocalyptic number.

It is an amenable number.

216442920949 is a deficient number, since it is larger than the sum of its proper divisors (1).

216442920949 is an equidigital number, since it uses as much as digits as its factorization.

216442920949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 216442920949 in words is "two hundred sixteen billion, four hundred forty-two million, nine hundred twenty thousand, nine hundred forty-nine".