221238926773 has 4 divisors (see below), whose sum is σ = 221246298988. Its totient is φ = 221231554560.

The previous prime is 221238926767. The next prime is 221238926791. The reversal of 221238926773 is 377629832122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40105269169 + 181133657604 = 200263^2 + 425598^2 .

It is a cyclic number.

It is not a de Polignac number, because 221238926773 - 2⁹ = 221238926261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221238926773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221238956773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3640908 + ... + 3701173.

It is an arithmetic number, because the mean of its divisors is an integer number (55311574747).

Almost surely, 2^221238926773 is an apocalyptic number.

It is an amenable number.

221238926773 is a deficient number, since it is larger than the sum of its proper divisors (7372215).

221238926773 is an equidigital number, since it uses as much as digits as its factorization.

221238926773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7372214.

The product of its digits is 3048192, while the sum is 52.

The spelling of 221238926773 in words is "two hundred twenty-one billion, two hundred thirty-eight million, nine hundred twenty-six thousand, seven hundred seventy-three".