221300775 has 24 divisors (see below), whose sum is σ = 406538960. Its totient is φ = 118026720.

The previous prime is 221300759. The next prime is 221300801. The reversal of 221300775 is 577003122.

It is not a de Polignac number, because 221300775 - 2⁴ = 221300759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163252 + ... + 164601.

Almost surely, 2^221300775 is an apocalyptic number.

221300775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221300775 is a deficient number, since it is larger than the sum of its proper divisors (185238185).

221300775 is a wasteful number, since it uses less digits than its factorization.

221300775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327872 (or 327861 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 221300775 is about 14876.1814656853. The cubic root of 221300775 is about 604.8685141029.

Adding to 221300775 its reverse (577003122), we get a palindrome (798303897).

The spelling of 221300775 in words is "two hundred twenty-one million, three hundred thousand, seven hundred seventy-five".