221238705 has 8 divisors (see below), whose sum is σ = 353981952. Its totient is φ = 117993968.

The previous prime is 221238701. The next prime is 221238713. The reversal of 221238705 is 507832122.

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

It is a cyclic number.

It is not a de Polignac number, because 221238705 - 2² = 221238701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221238701) 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 7 ways as a sum of consecutive naturals, for example, 7374609 + ... + 7374638.

It is an arithmetic number, because the mean of its divisors is an integer number (44247744).

Almost surely, 2^221238705 is an apocalyptic number.

It is an amenable number.

221238705 is a deficient number, since it is larger than the sum of its proper divisors (132743247).

221238705 is a wasteful number, since it uses less digits than its factorization.

221238705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14749255.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 221238705 is about 14874.0950985262. The cubic root of 221238705 is about 604.8119580435.

The spelling of 221238705 in words is "two hundred twenty-one million, two hundred thirty-eight thousand, seven hundred five".