221776773 has 8 divisors (see below), whose sum is σ = 296041536. Its totient is φ = 147681600.

The previous prime is 221776771. The next prime is 221776799. The reversal of 221776773 is 377677122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221776773 - 2¹ = 221776771 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221776771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39313 + ... + 44598.

It is an arithmetic number, because the mean of its divisors is an integer number (37005192).

Almost surely, 2^221776773 is an apocalyptic number.

It is an amenable number.

221776773 is a deficient number, since it is larger than the sum of its proper divisors (74264763).

221776773 is an equidigital number, since it uses as much as digits as its factorization.

221776773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84795.

The product of its digits is 172872, while the sum is 42.

The square root of 221776773 is about 14892.1715340645. The cubic root of 221776773 is about 605.3018760768.

The spelling of 221776773 in words is "two hundred twenty-one million, seven hundred seventy-six thousand, seven hundred seventy-three".