221543340777601 has 4 divisors (see below), whose sum is σ = 221546720552704. Its totient is φ = 221539961002500.

The previous prime is 221543340777527. The next prime is 221543340777617. The reversal of 221543340777601 is 106777043345122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221543340777601 - 2⁹ = 221543340777089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221543340777701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1689789225 + ... + 1689920326.

It is an arithmetic number, because the mean of its divisors is an integer number (55386680138176).

Almost surely, 2^{221543340777601} is an apocalyptic number.

It is an amenable number.

221543340777601 is a deficient number, since it is larger than the sum of its proper divisors (3379775103).

221543340777601 is an equidigital number, since it uses as much as digits as its factorization.

221543340777601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379775102.

The product of its (nonzero) digits is 5927040, while the sum is 52.

The spelling of 221543340777601 in words is "two hundred twenty-one trillion, five hundred forty-three billion, three hundred forty million, seven hundred seventy-seven thousand, six hundred one".