221264907 has 4 divisors (see below), whose sum is σ = 295019880. Its totient is φ = 147509936.

The previous prime is 221264903. The next prime is 221264917. The reversal of 221264907 is 709462122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221264907 - 2² = 221264903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221264903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36877482 + ... + 36877487.

It is an arithmetic number, because the mean of its divisors is an integer number (73754970).

Almost surely, 2^221264907 is an apocalyptic number.

221264907 is a deficient number, since it is larger than the sum of its proper divisors (73754973).

221264907 is an equidigital number, since it uses as much as digits as its factorization.

221264907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73754972.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 221264907 is about 14874.9758655266. The cubic root of 221264907 is about 604.8358336991.

The spelling of 221264907 in words is "two hundred twenty-one million, two hundred sixty-four thousand, nine hundred seven".