221750505 has 12 divisors (see below), whose sum is σ = 384367620. Its totient is φ = 118266912.

The previous prime is 221750491. The next prime is 221750513. The reversal of 221750505 is 505057122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 117158976 + 104591529 = 10824^2 + 10227^2 .

It is not a de Polignac number, because 221750505 - 2¹⁹ = 221226217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2463850 + ... + 2463939.

It is an arithmetic number, because the mean of its divisors is an integer number (32030635).

Almost surely, 2^221750505 is an apocalyptic number.

It is an amenable number.

221750505 is a deficient number, since it is larger than the sum of its proper divisors (162617115).

221750505 is a wasteful number, since it uses less digits than its factorization.

221750505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927800 (or 4927797 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 221750505 is about 14891.2895680663. The cubic root of 221750505 is about 605.2779771246.

The spelling of 221750505 in words is "two hundred twenty-one million, seven hundred fifty thousand, five hundred five".