221038807 has 12 divisors (see below), whose sum is σ = 246951208. Its totient is φ = 197643600.

The previous prime is 221038771. The next prime is 221038889. The reversal of 221038807 is 708830122.

It is not a de Polignac number, because 221038807 - 2⁷ = 221038679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221038007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7593 + ... + 22354.

Almost surely, 2^221038807 is an apocalyptic number.

221038807 is a deficient number, since it is larger than the sum of its proper divisors (25912401).

221038807 is a wasteful number, since it uses less digits than its factorization.

221038807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30030 (or 30019 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 221038807 is about 14867.3739106811. The cubic root of 221038807 is about 604.6297459061.

Adding to 221038807 its reverse (708830122), we get a palindrome (929868929).

The spelling of 221038807 in words is "two hundred twenty-one million, thirty-eight thousand, eight hundred seven".