221740707 has 8 divisors (see below), whose sum is σ = 313045776. Its totient is φ = 139131392.

The previous prime is 221740693. The next prime is 221740789. The reversal of 221740707 is 707047122.

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 221740707 - 2⁸ = 221740451 is a prime.

It is a super-2 number, since 2×221740707² = 98337882281719698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221740007) 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, 2173878 + ... + 2173979.

It is an arithmetic number, because the mean of its divisors is an integer number (39130722).

Almost surely, 2^221740707 is an apocalyptic number.

221740707 is a deficient number, since it is larger than the sum of its proper divisors (91305069).

221740707 is a wasteful number, since it uses less digits than its factorization.

221740707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4347877.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 221740707 is about 14890.9605801641. The cubic root of 221740707 is about 605.2690622994.

Adding to 221740707 its reverse (707047122), we get a palindrome (928787829).

It can be divided in two parts, 2217 and 40707, that added together give a palindrome (42924).

The spelling of 221740707 in words is "two hundred twenty-one million, seven hundred forty thousand, seven hundred seven".