221535512233979 has 2 divisors, whose sum is σ = 221535512233980. Its totient is φ = 221535512233978.

The previous prime is 221535512233951. The next prime is 221535512234017. The reversal of 221535512233979 is 979332215535122.

It is a happy number.

221535512233979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221535512233979 - 2⁸ = 221535512233723 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221535512230979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767756116989 + 110767756116990.

It is an arithmetic number, because the mean of its divisors is an integer number (110767756116990).

Almost surely, 2^{221535512233979} is an apocalyptic number.

221535512233979 is a deficient number, since it is larger than the sum of its proper divisors (1).

221535512233979 is an equidigital number, since it uses as much as digits as its factorization.

221535512233979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618000, while the sum is 59.

The spelling of 221535512233979 in words is "two hundred twenty-one trillion, five hundred thirty-five billion, five hundred twelve million, two hundred thirty-three thousand, nine hundred seventy-nine".