16333224187921 has 2 divisors, whose sum is σ = 16333224187922. Its totient is φ = 16333224187920.

The previous prime is 16333224187913. The next prime is 16333224187927. The reversal of 16333224187921 is 12978142233361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16330578114321 + 2646073600 = 4041111^2 + 51440^2 .

It is a cyclic number.

It is not a de Polignac number, because 16333224187921 - 2³ = 16333224187913 is a prime.

It is not a weakly prime, because it can be changed into another prime (16333224187927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8166612093960 + 8166612093961.

It is an arithmetic number, because the mean of its divisors is an integer number (8166612093961).

Almost surely, 2^{16333224187921} is an apocalyptic number.

It is an amenable number.

16333224187921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16333224187921 is an equidigital number, since it uses as much as digits as its factorization.

16333224187921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 52.

The spelling of 16333224187921 in words is "sixteen trillion, three hundred thirty-three billion, two hundred twenty-four million, one hundred eighty-seven thousand, nine hundred twenty-one".